Question

A system of equations is shown below: Equation A: 3c = d − 8 Equation B: c = 4d + 8 Which of the following steps should be performed to eliminate variable d first?

Answer 1

multiplying the equation A

Explanation:

3c=d-8 ####### *4

+ c=4d + 8

After that you will get the value of c and d.

Answer 2

Multiply equation A by -4

Explanation:

3c = d - 8

c = 4d + 8

Multiply equation A by -4.

-12c = -4d + 32

c = 4d + 8

Add the equations.

-11c = 40

Variable d is eliminated.