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

Answer 1

Whenever i'm solving for a linear system of equations, i usually number my equations to keep track of them just in case.

Here, lets order them from top to bottom, 1, 2 and 3.

So if we add, 1+2 we get
4x-y+z = 6
+ 3x+2y-z=0
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Now just add like terms. basically add straight down. What do you get?

Answer 2

thnx