Question

Solve the system by substitution.
2x - y + z = -4
z = 5
-2x + 3y - z = -10

Answer 1

Answer: a

Step-by-step explanation: that person coulda said that

Answer 2

Substituting z = 5 into the first equation:

2x - y + 5 = -4
y = 2x + 9

Substituting y and z into the third equation
-2x + 3(2x + 9) - 5 = -10
4x + 27 = -5

x = -8
y = 2(-8) + 9 = 7
z = 5