MATHEMATICS MIDDLE SCHOOL

How do I solve x=y+8
and 5x+3y=12in substitution form

Answers

Answer 1

Answer: 5*(y + 8) + 3*y = 12 <=> 8*y + 40 = 12 ,<=> 8*y = -28 < => y = -7/2;

x = y + 8 => x = -7/2 + 8 => x = 9/2.

Answer 2

Answer:

Answer:

x = 4.5 and y = -3.5

Step-by-step explanation:

To find the solution to this system of equations using the substitution method, you must solve for either the x or y variable and then substitute into the other equation.

x = (y + 8)

5x + 3y = 12

We will use the first equation to solve for x. The x has to be isolated on one side. Since the first equation already has x on the one side, we can plug it into the other equation.

5(y+8) + 3y = 12

Distribute and solve:

5y + 40 + 3y = 12

8y + 40 = 12

8y = 12-40

8y = -28

y = -3.5

Now we have the y variable, we can plug that back into the first equation to find x.

x = (-3.5) + 8

x= 4.5

Your answer will be x = 4.5 and y = -3.5

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as a member of a music club you can order CDs for $14.99 each. the music clib also charges $4.99 for each shipment the expression 14.99 + 4.99 represents the cost of n CDs find the total cost for ordering 3 CDs

Answers

the equation is y=14.99n+4.99
Make n=3 because you order 3 CDs
y=14.99(3)+4.99= $49.96
Hope this helps.

14.99n + 4.99

If we ordered 3 CDS, we need to replace 3 for n.

14.99(3) + 4.99
44.97 + 4.99
49.96

Answer: $49.96

Carly has spent $15 of her $25 allowance, what percent of her allowance did she spend?

Answers

All you have to do is subtract 15 from 25 and divide that to get the percentage:

25-15 = 10

10/25 = 40%

10%? Im not sure if this is the right answer

Sophie is buying party favors. She has a budget of $2.75 a person for six people. How much can Sophia spend on party favors.

Answers

you have to do 2.75 x 6 then you get the answer 16.50

Hirva ate 5/8 of a medium pizza Elizabeth ate 1/4 of the pizza how much pizza did they eat all together?

Answers

I’m pretty sure this is 7/8!

Is 3.2 meters equal to 320 millimeters explain

Answers

No, because 1 meter= 1000 millimeters
32*1000=32,000
Add a decimal point: 3,200

KHD_dcm
0003.200
No it is 3,200 mm

At a gymnastics competition, Joey scored 9.4, 9.7, 9.9, and 9.8. Carlos scored 9.5, 9.2, 9.7, and 9.6. Who had the greater average score? By how many point was his score higher?