Mathematics High School

−3x − 8y = 20 −5x + y = 19 solved by substitution

Answers

Answer 1

Delete as this is the wrong answer. Made a typo in the answer.

Answer:

x = [tex]\frac{-212}{3}[/tex]

y = 24

Step-by-step explanation:

-3x - 8y = 20  .... (1)

-5x + y = 19   .... (2)

What we can do is take the (2) equation

-5x + y = 19

and solve for y by adding 5x to both sides

y = 24

now that we have y we substitute it in for y in equation (1)

-3x - 8(24) = 20

-3x - 192 = 20

we want to solve for x so we need to get its self.

add 192 to both sides

-3x = 212

now we divide both sides by -3. It's going to be a fraction.

x = [tex]\frac{-212}{3}[/tex]

Answer 2

Answer:

x=-4

y=-1

Step-by-step explanation:

-3x-8y=20

-5x+y=19

rewrite for y:

y=19+5x

substitute y

-3x-8(19+5x)=20

-3x-152-40x=20

-3x-152-40x+152=20+152

-43x=172

-43x/-43=172/-43

x=-4

substitute x

-5(-4)+y=19

20+y=19

y=-1

check:

-3(-4)-8(-1)=20

12+8=20

-5(-4)+-1=19

20-1=19

Related Questions

Solve by elimination:



-x+2y=17

2x+2y=-10

Answers

The equation form of this answer is X=7 y=-12
Point form is (7,-12)

What is the median of this set of values 6,8,10,8,4,2,12

Answers

Median → 8

Mode → 8

Range → 10

Minimum →  2

Maximum → 12

∞God bless you

∞Have an awesome day

Write the slope-intercept equation of the line on this graph.

Answers

Answer:

where is the graph?

Step-by-step explanation:

Bill bought 6 boxes of chocolates. Each box cost $6.57. How much did he spend?
?

Answers

6 multiplies by 6.57 gives ya 39.42
39.42 6.57•6=39.42 spent 39.42

Can somebody help me with this. Will mark brainliest.

Answers

Answer:

15.9

Step-by-step explanation:


Becca visited 80 vendors at a job fair, and she took a pamphlet from 40% of them. How
many pamphlets did Becca take?

Answers

Answer:

bella in the clouds widhsgnv

Step-by-step explanation:

whats the answer to 3x+4=6x+19

Answers

Answer:

x = -5

Step-by-step explanation:

[tex]3x + 4 = 6x + 19\\-3x + 4 = 19\\-3x = 15\\x = -5[/tex]

3x+4=6x+19 subtract 3x from both sides
4=3x+19 subtract 19 from both sides
-15=3x divide by 3 on both sides
-5=x
The answer is x=-5

whats 6 divided by 2/3

Answers

Step-by-step explanation:

6 divided by 2/3 is 9

HOPE IT HELPS U

your answer is 9

explanation:

find the vertex of the following equation
y= (x+9)^2+8
​

Answers

(-9,8) is the answer (h,k) is the equation

2a + 3b = 5
b = a - 5
How would I solve this ?

Answers

Let me help ya

Step-by-step explanation:

lol I do iready too so first replace the varbile with what ever number they have then you multiply it

5 the answer isieirjjfjriroeoeoeoosodkdkririeje

If i went to the store to buy sandwiches should i buy $4.95 for 3 sandwiches or $6.72 for 4 sandwiches what is the best deal?

Explanation why?

Answers

Best deal would be 4.95 for 3 because if you divide the numbers you end up paying more money for the 4 sandwiches. For comparison heres my results
$4.95 for 3 - $1.65 each
$6.72 for 4 - $1.68 each

can someone please help me, i have a time limit, does anyone know the answer for number 6?!

Answers

Answer:

36.7 I do believe Im not really sure though

Answer:

I believe it is 35.3

180-(90+27)

x/Sin63=18/Sin27

x=18Sin63/Sin27

x=35.3

Use the first five terms of the exponential series of ex and a calculator to approximate the value of e^1.36 o the nearest hundredth. a. 3.85 c. 1.65 b. 3.35 d. 1.95

Answers

Answer: a. 3.85

Step-by-step explanation:

plz answer only if u know ur correct. tyvm. will give brainliest to best answer

look at the picture

Answers

Answer:

3

Step-by-step explanation:

Answer:

3

Step-by-step explanation:

When x goes up by 1 y goes up by 3

Find the value of x in the shape to the right if the volume is 800π.

A. 16
B. 20
C. 24
D. 30

Answers

Answer:

Su respuesta sería B20, pero no estoy seguro, por lo que es posible que desee volver a verificar y hacer su trabajo.

Step-by-step explanation:

I feel like is B. 20 but I’m not sure!

Explain why 21i^2 is equivalent to -21

Answers

Answer:

Step-by-step explanation:

The imaginary number 'i' is equal to the square root of -1. If you were to square the square root, they both cancel and you get -1.

[tex]21i^2=21(\sqrt{-1} )^2=21(-1)=-21[/tex]

Neely has $1.73 in coins. He gives his friend 1 quarter and 3 nickels.
What is the value of the coins he has left?

Answers

Answer:

2.13

Step-by-step explanation:

1.73+.25=1.98

1.98+.15= 2.13

Answer:

1.33

Step-by-step explanation:

A quarter is worth 25 cents so subtract it from $1.73.

1.73 - .25 = 1.48

So then you subtract the 3 nickels which equal 15 cents.

1.73 - .15 = 1.33

So the value left is $1.33.

(GIVING BRAINLIEST!!)
Gethyn drinks 48 fluid ounces of water in one day. He needs to drink 8 cups in total. How many more cups does he need to drink?


A) 2 cups
B) 6 cups
C) 384 cups
D) 768 cups

(IF U STEAL POINTS/SAY SOMETHING RANDOM THAT DOESNT HAVE ANYTHING TO DO WITH MY QUESTION ILL REPORT (❁*ᵕ*)︻╦╤─)

Answers

He needs to drink 2 more cups. Explanation: 8 ounces are in 1 cup. He drank 48 fluid ounces of water. 48 ounces of water = 6 cups. He needs to drink 8 cups total. 8-6 = 2.

Answer:

A.) 2 cups

Step-by-step explanation:

If AB = 16 inches and AB is dilated by a scale factor of 3/2
find A'B

Answers

Answer:

24 inches

Step-by-step explanation:

16x(3/2)=24

Mitzi has 79 coins she divides the coins equally among herself and her 3 brothers Mitzi will keep any coins left over how many coins does each person get

Answers

Answer:

19

Step-by-step explanation:

79÷4=19R3

       ≈ 19

25+42-47%=?
please help me

Answers

Answer:

The answer is 20!!!

Step-by-step explanation:

Hope this helps :))

So we are going to do do 1/3 divided by 3/5. I
will ending up changing this to 1/3 times what?

Answers

Answer:

5/9

Step-by-step explanation:

flip the second fraction and then multiply the numerators with each other then the denominators with each other

1/3 x 5/3 = 5/9

Convert 5 ounces into kilograms. Round your answer to the nearest hundredth.

Answers

Answer:

Answer: 0.141 kilos

0.141748

Step-by-step explanation:

The conversion is 0.1417475 Kg

What is Unit conversion?

Conversion of units is the conversion between different units of measurement for the same quantity, typically through multiplicative conversion factors which change the measured quantity value without changing its effects.

given:

5 ounces

So, to convert ounces to kilogram we have

1 ounce = 0.0283495 Kg

So, 5 ounces = 5* 0.0283495

5 ounces = 0.1417475 Kg

Hence, 5 ounces = 0.1417475 Kg

Learn more about unit conversion here:

https://brainly.com/question/11543684

#SPJ2

Can someone help me?

Answers

Answer:

$150

Step-by-step explanation:

3% as a percentage multiplier is 0.03

so 5000 x 0.03 = 150 which is 3% of 5000

You should only start the vehicle after you. What?

Answers

Answer:

Buckle your seatbelt

Step-by-step explanation:

Answer:

You should only start the vehicle you should Fasten your seatbelt and make sure that your review mirrors are where you want them to be so you can see the back clearly.

Step-by-step explanation:

Im 17 years old and I been driving a car for a while now and that what my parents told me. Hopefully this helps.

Write the number 120 in scientific notation.

Answers

Answer:

The answer is A x 10 b

the answer is 1.2 x 10^2 it gives you 120

2) (89° + 10a + 2) = (a + 1)

Answers

Answer:

a = -10

Step-by-step explanation:

89 + 10a + 2 = a + 1

91 + 10a = a + 1

9a = - 90

a = -10

Help with this pleaseeeeee!!!!!!!

Answers

Answer:

60

Step-by-step explanation:

V=Base area*height

V=((5*8)/2)*3

V=(40/2)*3

V=20*3

V=60

4.2r - 12.68 = 10
how to sole it to plz

Answers

r=5.4

4.2r-12.68=10
+12.68 +12.68
4.2r=22.68
4.2/4.2 22.68/4.2
22.68/4.2= 5.4

Hope this helps! Have a great day :)

Hi there!

r=5.4

1.Add the terms:

[tex]22.68*4.2=5.4[/tex]

2.Divide the two terms:

[tex]22.68*4.2=5.4[/tex]

Therefore, r=5.4.

In NOP,the measure of p=90 the measure of n=59 and PN=7.4 feet.Find the length of OP to the nearest tenth of a foot

Answers

Answer:

12.3 feet

Step-by-step explanation:

Given

<P = 90 degrees

<N = 59 degrees

PN = 7.4 feet

Required

OP

NO = hypotenuse

OP = adjacent

PN = opposite = 7.4

Using SoH CAH TOA identity

tan <O =PN/OP

tan (180-149) = 7.4/OP

tan 31 = 7.4/OP

OP = 7.4/tan 31

OP = 7.4/0.600

OP = 12.3 feet (to the nearest tenth)

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