Answer :
Two perpendicular lines have inverse reciprocal slopes.
m = - 1
y = mx + b
where:
m: slope
b: y-intercept
y = -x + b
using thg point (1,-5):
-5 = - 1 + b
b = -4
y = -x - 4
m = - 1
y = mx + b
where:
m: slope
b: y-intercept
y = -x + b
using thg point (1,-5):
-5 = - 1 + b
b = -4
y = -x - 4