Solve the system of equations using elimination 3c - 8d =7 and c + 2d = -7

d=-2 c=-3

Step-by-step explanation:

3c-8d=7

4(c+2d=-7)

3c-8d=7

4c+8d=-28

4c+3c-8d+8d=7-28

7c=-21

c=-3

c+2d=-7

-3+2d=-7

2d=-4

d=-2

Given.

Multiply 4 to the second equation.

Compare the like terms.

Solve.

Divide 7 to both sides

Substitute (-3) for c into the original second equation.

Add (3) to both sides.

Divide (2) to both sides.

Check your work.

Therefore your answer is.

answer: the first one

step-by-step explanation: use a calculator and divide the minutes by the dollars.

go and ask your mom to you