standard form of (2,-4) slope : -1
y = mx + bslope(m) = -1(2,-4)...x = 2 and y = -4now we sub and find b, the y int-4 = -1(2) + b-4 = -2 + b-4 + 2 = b-2 = by = -x - 2x + y = -2 <== standard form