Question

Find the solution to the system of equations.

2x + 3y + z = 20
3y + 5z = 12
y - 5z = 4


A. x = 2, y = 5, z = 0
B. x = 4, y = 4, z = 0
C. x = 3, y = -2, z = 4
D. x = 3, y = 3, z = 0

Answer 1

use bottom equation to solve for y, sub that into second equation to solve for z. use both those to find x

Answer 2

B

Answer 3

The matrix shown below represents which system of equations?