Question

Solve the system of equations by substitution.

-3x - 2y + 2z = 19
2x + y + 3z = -20
Z = -2

Answer 1

Explanation:

-3x - 2y + 2(-2) = 19

-3x -2y - 4 = 19

-3x - 2y = 23

2x + y - 6 = -20

2x + y = -14

-3x -2y = 23

2x + y = -14

-3x - 2y = 23

4x + 2y = -28

x = -5

-10 + y = -14

y = -4

x= -5, y = -4, z= -2