1- start with the original equation
x=2y+70
Let y =3x
x=2x 3x+70
simplify
x=6x+70
2-solve for x.
x=6x+70
Subtract 6x from both sides
x-6x=70
simplify x-6x to -5x
-5x=70
divide both sides by -5
x=- 70/5
simplify 70/5 to 14
x=-14
3- start with an original equation .
y=3x
Let x =-14
y=3x -14
simplify
y=-42
therefore
x=-14
y=-42
