Question

Find the solution to the system of equations.

3x+ 2y - 4z = -7
x - 4y+ 5z = 9
2x + 2y - 5z = -12
A. x= 3, y = 1, z = 2
B. x = 1, y= 3, z= 4
C. x= 6, y= -3, z= -4
D. x = 3, y= 3, z= 2

Answer 1

1. 3×5+2×5-4×8= -7

15+10-32= -7

25-32= -7

2. 20-4×4+5×1= 9

20-16+5=9

4+5=9

9=9