Question

What is the solution to the system of equations?

-4x-5y-z=18,
-2x-5y-2z=12
-2x+5y+2x=4

PLZZZ I NEED HELP

Answer 1

simplify third eqn -2x+5y+2x=4
5y=4
y=4/5

substitute back to 1st n 2nd eqn n solve for x n z
-4x-4-z=18 and -2x-4-2z=12
simplify -4x-z=22 and -2x-2z=16
-4x-(-x-8)=22
-3x+8=22
x=-14/3
z=-10/3
y=4/5