Question

Solve the equation -4x + 7 y equals 20. Y=3x+15

Answer 1

Substitue what y equals for y and solve.

`</p><p>-4x+7(3x+15)=20 \\</p><p>-4x+27x+105=20 \\</p><p>23x=-85 \\</p><p>x=-\boxed{(85)/(23)}</p><p>`

Hope this helps.