Question

What is the solution of the system? Use substitution
x=-2y+10
-6y=6x-6
z=-3x +10y

Answer 1

Using the first one
x = -2y + 10

Substitute x into the 2nd equation

-6y = 6 (-2y +10) -6
-6y = -12y + 60 - 6
-6y = -12y +54
-12y - -6y = 54
-12y + 6y = 54
-6y = 54
y = -9

Then
x = -2y + 10
x = -2(-9) + 10
x = 18 + 10
x = 28

Can you go on?

Answer 2

z = -3x +10y
z = -3(28) + 10(-9)
z = -84 + -90
z = -84 - 90
z = -84-90
z = -174

Answer 3

i have no idea what all the this is