Question

Find the solution to the system of equations.

3x+2y-4z =-7
x-4y +5z =9
2x+ 2y-5z=-12

A.x = 1, y = 3, z = 4
B.x = 3, y = 3, z = 2
C.x = 6, y = -3, z = -4
D.x = 3, y = 1, z = 2

Answer 1

the easiest way to do this is to just plug in the answer choices and see which one works... although sometimes you're not given options and you have to use substitution