Y = 4x - 9 and y = x-3 so the two right sides (4x-9 and x-3) must be equal
4x-9 = x-3
Let's solve for x
4x-9 = x-3 4x-9+9 = x-3+9 ... add 9 to both sides 4x = x+6 4x-x = x+6-x ... subtract x from both sides 3x = 6 3x/3 = 6/3 ... divide both sides by 3 x = 2
If x = 2, then y is... y = 4*x - 9 = 4*2-9 = 8-9 = -1 which can also be found by y = x-3 = 2-3 = -1
