Answer:
Two lines are perpendicular lines if they intersect at right angles. f(x)=m1x+b1 and g(x)=m2x+b2 are perpendicular if m1∗m2=−1, and m2=−1m1 f ( x ) = m 1 x + b 1 and g ( x ) = m 2 x + b 2 are perpendicular if m 1 ∗ m 2 = − 1 , and m 2 = − 1 m 1 .
