Answer:
Yes
Step-by-step explanation:
The idea is to use the formula for perpendicular gradients,
meaning m1 * m2 = -1
Since L2 passes through 2 points and to find gradient we just need 2 points,
we can use the 2 given points given
L2 gradient is (9 - (-7)) / (7 - (-1)) = 16/8 = 2
x + 2y = 4 rewrite as y = -(0.5)x + 2
so our m1 is -0.5 and m2 is 2
-0.5 * 2 = -1 which was what we wanted to show.
L1 and L2 are perpendicular
