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?

Multiply equation A by −4.
Multiply equation B by 3.
Multiply equation A by 3.
Multiply equation B by 4.

Answer 1

The answer is A. Multiply equation A by −4.

Hope This Helps!

Answer 2

probably the first one "multiply equation A by -4". In order to cancel them out out multiply the first equation by negative 4 and then you add both equations once you add both equations -4+4=0 so they cancel out.