Question

Turn
X+3y=12
And
X=y-8
Into the formula y=mx+b

Answer 1

Format the equations to solve for y. All you really need to do is add or subtract x then divid anything that is next to y onto the other side.

Answer 2

Just reorder the values.
x + 3y = 12
Subtract x from both sides.
x +3y - x = 12 - x
3y = 12 - x
Divide both sides by 3 so that y is completely isolated.
3y/3 = 12 - x /3
y = 4 - 1/3x
Now move the slope so it's in slope intercept form.
y= -1/3x + 4

x = y -8
Just add a positive 8 to both sides so y is isolated.
x + 8 = y - 8 + 8
x + 8 = y
Just turn into slope int. form again.