Question

What is 4x+y=7 when y=x-3?

Answer 1

`x=2, y=-1`

Explanation:

You can substitute your equation beginning with y into the first equation, to get `4x+(x-3)=7` .
Simplify:
`4x+x-3=7`
`5x=10`
And solve so
`x=2`.
Substitute into `y=x-3`
`y=(2)-3=-1`