Answer:
y = -2x + 3
Step-by-step explanation:
Let equation of the line be y = mx + b
Since the line is perpendicular to y = 1/2x - 10,
product of the gradient of both lines = -1
therefore,
1/2 x m = -1
m = -2
since it passes through (4, -5),
sub (4, -5):
-5 = -2(4) + b
b = 3
therefore, equation of the line is y = -2x + 3
