Question

A student is trying to solve the set of two equations given below:

Equation A: x + z = 6
Equation B: 2x + 4z = 1

Which of the following is a possible step used in eliminating the z-term?


Multiply equation B by 4.
Multiply equation A by 2.
Multiply equation A by –4.
Multiply equation B by 2.

Answer 1

To eliminate the z-term, you need to multiply equation A by -4.

Explanation:

Answer 2

Hello,
Multiply equation A by –4.
=>-4x-4z=-24
2x+4z=1
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-2x=-23
x=23/2