Question

If you were to use the substitution method to solve the following system, choose the new system of equations that would result if z was isolated in the first equation.

2x – 5y + z = 15
4x – y + 3z = 15
3x – 2y + 2z = 13

choices:

22x + 16z = 90
11x + 8z = 43
–18x – 14z = –60
–5x + 8z = 43
10x – 16y = –30
7x – 12y = –15
–2x + 14y = –30
–x + 8y = –17