Y = 2x - 9.....slope here is 2. A perpendicular line will have a negative reciprocal slope. All that means is flip the slope and change the sign. So our perpendicular line will have a slope of -1/2.
y - y1 = m(x - x1) slope)m) = -1/2 (8,-1)....x1 = 8 and y1 = -1 now we sub...pay attention to ur signs y - (-1) = -1/2(x - 8)...not done yet y + 1 = -1/2(x - 8) <== ur perpendicular line
