Mathematics College

Solve the system by substitution.
-2y = x
7x+9y = -45

Answers

Answer 1

Answer:

9

Step-by-step explanation:

substitute the value

Related Questions

convert y=1/2x-5 into integers

Answers

Answer:

Use the slope-intercept form to find the slope and y-intercept.

Tap for more steps...

Slope:  

1

2

y-intercept:  

5

Any line can be graphed using two points. Select two  

x

values, and plug them into the equation to find the corresponding  

y

values.

Tap for more steps...

x

y

0

5

2

6

Graph the line using the slope and the y-intercept, or the points.

Slope:  

1

2

y-intercept:  

5

x

y

0

5

2

6

image of graph

the quotient of two numbers is 4 and their difference is 39. What is the smaller number of the two?

Answers

Answer:

13

Step-by-step explanation:

x/y = 4

x=4y

x - y = 39

4y - y = 39

3y = 39

y= 13

Please answer this correctly without making mistakes

Answers

Answer:

second coupon with 15% off

Step-by-step explanation:

366.99-50= 316.99(first coupon )

366.99×( 100%-15%)= 311.9415 (second coupon)

316.99>311.9415

so the second coupon is the one she should use

Ms. Psenicska is driving her car at 60 miles per hour. She then increases her speed by 25%. Which of the following expressions can be used to find her
new speed? Select all that apply
60 (0.75)
60 (0.25)
60 - 60 (0.25)
60+ 60 (0.25)
Cam you help me please

Answers

Answer:

60 (0.25)

Step-by-step explanation:

Best and Correct answer gets BRAINLIEST!!!!!

Answers

A is the answer!! Hope it helps

Please help
Find the equation of the line above

Answers

Well, you’d first have to find the slope by doing the rise over run method or whichever one you prefer.

This can be done by doing: m=-13/9

B would still be: b=1

This would leave us with the equation of y= -13/9x+1

Please need help on this one

Answers

Answer:

60°

Step-by-step explanation:

wx=√(9²+(3√3)²)=√(81+27)=√108=√(36×3)=6√3

[tex]cos w=\frac{3\sqrt{3}}{6\sqrt{3}} =\frac{1}{2} =cos ~60\\m \angle ~w=60^\circ[/tex]

Help PLEASE!!! This is urgent

Answers

Answer:

.3

Step-by-step explanation:

7+7+6=20

6 green out of 20 total

.30 chance

15, sqrt(200), 14
Order from least to greatest

Answers

Answer:

14, sqrt(200), 15

Step-by-step explanation:

14 is the least sqrt(200) equals 14.14 then 15

Lisa spends part of her year as a member of the gym. She then finds a better deal at another gym, so she cancels her membership with the first gym and spends the rest of the year with the second gym. (12 months total at these gyms.) The membership to the first gym costs $75 per month, while the membership for the second gym cost $50 per month. She ends up spending a total of $775 over the course of the year. ​

Answers

Answer:

Number of month in first gym = 7

Number of month in second gym = 5

Step-by-step explanation:

Given:

First gym member ship cost = $75 per month

Second gym member ship cost = $50 per month

Total spending = $775

Computation:

Number of month in first gym = a

Number of month in second gym = b

So

a + b = 12....eq1

75a + 50b = 775 ....eq2

From eq 1 and 2

a = 7 month

b = 5 month

Number of month in first gym = 7

Number of month in second gym = 5

HELP ME ASAP ILL GIVE BRAINLIST

Answers

Answer:

A'B'=2AB

Step-by-step explanation:

Line A'B' is also dilated by the same scale factor of 2 and is therefore equal to 2*AB or 2AB

Emmett surveyed his class about the number of books his classmates read over the summer. The results of his survey are shown in the
following table.
Number of books Number of students
0-1
9
2-3
8
4-5
2
6-7
5
8-9
3
Emmett created the following histogram from the data, but he made mistakes while constructing it.
Select the parts of the histogram that Emmett needs to fix for the histogram to accurately represent the data in the table.
Number of Books Read
During Summer Break
у
10
Number of Students
8
6
0
10
8
Number of Books Read
no

Answers

Answer:

The bar 4-6 and 8-10

Step-by-step explanation:

I got it correct.

Kevin went car shopping. The scatterplot at the right shows the relationship between the number of miles each of the cars had and their price. Based on the scatterplot, how much would a car with 75,000 miles cost?

Answers

How much money to a mile

Write an equation for each line (L,P,N,M)

Answers

do you have it on edg???

Mark has taken 3 tests this semester and his average is a 78%. He really wants to
get his test average to an 80% after his next test. What does he need to get on test
#4 to do that?

Answers

Answer:

I would say 82 but it depends on how much each test was worth.

Step-by-step explanation:

WILL GIVE BRAINLIEST IF CORRECT!!

How many different 7-digit positive integers exist? (Note that we don't allow "7-digit" integers that start with 0, such as 0123456; this is actually a 6-digit integer.)

Answers

[tex]\huge\boxed{\fcolorbox{red}{pink}{Answer}}[/tex]

[tex]\huge\pink{▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬}[/tex]

[tex] <marquee behaviour-move> <font color="blue"> <h1>9,000,000 seven</ ht> </marquee> [/tex]

[tex]\huge\pink{▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬}[/tex]

Caroline saved $3.84 on a discounted item that was marked down 15% off of the original price of the item. What was the
original price of the item before the discount?
A $57.60
$18.84
OC $4.42
D $25.00

Answers

The correct answer is D.

pls help I will fail 10th grade

Answers

Answer: A

Step-by-step explanation: Okay so there are plenty of steps to this equation but to save you time, the answer is A. If your puting

you answer into decimal form it woukd equal x= 4  x= -2.5

Slope=1/4; y -intercept = 2

Answers

Answer:

y=1/4x+2

Step-by-step explanation:

im not sure what your problem is here, so im just gonna assume you have to put it into slope intercept form

Y=1/4x+2
I’m not sure what you mean here but I’m gonna assume you want it in this format

i need help asap what is 12g + 9g

Answers

Answer:

21 g

Step-by-step explanation:

you add 12g by 9g and you get 21g

Answer:21g

Step-by-step explanation: The answer is 21g

The other answer choice is 30

Answers

Answer:

21 pencils

Step-by-step explanation:

b 21 pencils

find the GCF of 24 and 63​

Answers

Answer:

3

Step-by-step explanation:

:) mark me as brainlist?

Answer:

3

Step-by-step explanation:

The GCF is the largest common positive integer that divides all the numbers (24,63) without a remainder

Which inequality represents this graph? 3y-9>6

Answers

Answer:  open hole at 5 and shading to the right.

The graph is below.

=======================================================

Explanation:

Let's solve for y

3y - 9 > 6

3y > 6+9

3y > 15

y > 15/3

y > 5

The graph will have an open hole at 5 and shading to the right.

I need help on this math question please fully answer the question i need help.

Answers

So first the answer is why aren’t you doing it yourself and the second one is I don’t understand why you need to be using brainless

Use substitution to solve the system x=2y-5 and -2x+5y=11

Answers

Answer:

(-3, 1)

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to Right

Equality Properties

Algebra I

Solving systems of equations by substitution/elimination

Step-by-step explanation:

Step 1: Define Systems

x = 2y - 5

-2x + 5y = 11

Step 2: Solve for y

Substitution

Substitute in x:                    -2(2y - 5) + 5y = 11Distribute -2:                       -4y + 10 + 5y = 11Combine like terms:           y + 10 = 11Isolate y:                              y = 1

Step 3: Solve for x

Define original equation:                    x = 2y - 5Substitute in y:                                     x = 2(1) - 5Multiply:                                                x = 2 - 5Subtract:                                               x = -3

A container is leaking 1 liter every 3/4 hour.How many liters will it leak in 3 3/4 hours

​

Answers

Answer: 5 liter

Explanation:

1 liter leaked for every 3/4 hr

X liter leaked in 3 3/4hr

And: 3 3/4 = 15/4

Find x:

1/x = (3/4)/(15/4)
(3/4)x = 15/4
x = 15/4 x 4/3
x = 5

A car journey has two stages.
Stage 1: The car travels 110 miles in two hours
Stage 2: The car travels 44 miles at the same average speed as stage 1
Work out the time for stage 2
Give your answer in minutes.

Answers

Answer:

48 minutes

Step-by-step explanation:

2h = 110 miles

1h = 110 ÷ 2

    = 55 miles

Therefore, the speed of the entire journey is 55 miles per hour.

1h = 60 minutes

55 miles = 1h

55 miles = 60 minutes

44 miles = [tex]\frac{44}{55}[/tex] × 60 minutes

              = 48 minutes

how many solutions does this problem have: 2(75 + 8) = 5(85 + 9)​

Answers

0 solutions.

2(75+8) =5(85+9)

166≠470

Which angle is congruent to ∠DFE?

An illustration shows two right angled triangle A B C and D E F; triangle A B C is larger than triangle D E F.

A.
∠ABC

B.
∠FDE

C.
∠FED

D.
∠ACB

Answers

The option D is correct. i.e., ∠ACB

In the given question is that

Which angle is congruent to ∠DFE

Answer is   ∠DFE ~  ∠ACB

Explanation: By using the illustration  shows two right angled triangle ABC and triangle DEF :

Now, If in triangles ABC and triangle DEF

Angle C = Angle F (Right angle)

CB = FE (leg)

AB = DE (hypotenuse)

then, triangle ABC is congruent to triangle DEF.

By SAS rule

Whole triangle ABC is congruent to triangle DEF. Then, we can say that

∠DFE ~  ∠ACB  

Hence, The option D is correct. i.e., ∠ACB

Learn more about Triangle Congruency at:

https://brainly.com/question/19258025

#SPJ1

What is the equation of the line that passes through the point (4, -4) and has a
slope of –3/4?

Answers

Answer:

y=-3/4x-1

Step-by-step explanation:

y=mx+b; y is the y coordinate; m is the slope; x is the x coordinate; you have to find b. So you replace all the numbers out which is given to you;

-4=-3/4(4)+b (you multiply -3/4 by 4 and get -3)

-4=-3+b (you add 3 to both sides and get -1)

-1=b (you now found b so plug it into the equation)

y=-3/4x-1

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