Practice problem
Find the line that is perpendicular to x−8y=16x-8y=16x−8y=16 and that contains the point (−9,9)(-9,9)(−9,9).
y=18x−72y=\frac{1}{8} x-72y=81x−72
y=−18x−72y=-\frac{1}{8}x-72y=−81x−72
y=8x−63y=8x-63y=8x−63
y=−8x−63y=-8x-63y=−8x−63
Type a concept, like “slope” or “photosynthesis”.