How do solve the following linear system?: 3x - y = -6, y = 4x + 4 ?
1 Answer
Dec 16, 2015
x=2
y=12
Explanation:
3x-y=-6
We replace the y with 4x+4
3x-(4x+4)=-6
3x-4x-4=-6
-x=-6+4
-x=-2 /-1
x=2
y=4*2+4
y=8+4
y=12
Let's see it it's true
3*2-12=-6?
6-12=-6
-6=-6 TRUE
