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If you were to use the substitution method to solve the following system, choose the new system of equations that would result if x was isolated in the second equation.
3x + y + 2z = 1
x + 2y – z = –8
3x – y – 3z = 18
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These are the answer choices. so it would be the 3rd answer?
7y – z = 25
5y – 6z = 42
–5y + 5z = 25
–7y = 42
–5x – 5z = –10
6x – z = 19
7x + 3z = –10
0x – 5z = 19
Sorry, I eliminated z, so none of the equations match.
Here I have eliminated x, with the following:
5y-5z = -25
7y = -42
So that's (B),
I realize the signs have been inverted, but that depends on the order of subtraction. I like to subtract in the direction that gives a positive sign to the variables.