Question

3y-5z=-23
4x+2y+3z=7
-2x-y-z=-3

Answer 1

Hope it helps you(The pictures are where the answer is)

Answer 2

Answer: x = 4, y = -6, z = 1

Explanation:

EQ2: 4x + 2y + 3z = 7 → 1(4x + 2y + 3z = 7) → 4x + 2y + 3z = 7

EQ3: -2x - y - z = -3 → 2(-2x - y - z = -3) → -4x -2y - 2z = -6

z = 1

EQ1: 3y - 5z = -23

3y - 5(1) = -23

3y - 5 = -23

3y = - 18

y = -6

EQ3: -2x - y - z = -3

-2x - (-6) -(1) = -3

-2x + 6 - 1 = -3

-2x + 5 = -3

-2x = -8

x = 4