y+4 = (x+6), you want it to look like this: Ax + By = C where A is positive: Get rid of the fraction by multiplying both sides by 3 3·(y+4) = 3·(x+6) 3y + 12 = 1(x + 6) 3y + 12 = x + 6 -x + 3y = -6 Multiply thru by -1 x - 3y = 6 Edwin