Question

How do I step by step solve a substitution equation?

Solve this equation by substitution:

3x-3y=4
-x+y=-4

Answer 1

No solution

Explanation:

Set -x+y=-4 to y

y=x-4

Substitute y into 3x-3y=4 and solve for x

3x-3(x-4)=4

3x-3x+12=4

12
`\\eq`4

No solution