Question

Eliminate the “z” variable in the first two equations by finding opposite coefficients and adding. What is the resulting equation?

4x – y + z = 6
3x + 2y – z = 0
4x – y – 3z = 2

a. 7x + y = 6

b.x – y = 6

c. x + y = 6

d.7x – y = 6

Answer 1

4x – y + z = 6
3x + 2y – z = 0
7x-y=6

Answer 2

4x - y + z = 6
3x + 2y - z = 0
so here we can see that the coefficient of the z terms are both one so we can apply addition straight away.
4x + 3x -y + 2y z - z 6 + 0
7x + y = 6

august I think u made a mistake in the y, it should be positive.

Answer 3

so answer should be A.

Answer 4

oh yes my bad