Question

What is the equation of the line that is perpendicular to -x + y = 7 and passes through (-1, -1)?
Possible answers:
-x + y = 2
-x – y= 2
x - y = 2
-x - y = 0
x + y = 0

Answer 1

the slope of a perpendicular line is the negative reciprocal of the slope of the given line
-x + y =7, so the slope is 1. Negative reciprocal of this is -1.
therefore, you have x+y=b
solve your b using your point.
you'll get: x + y =0

Answer 2

Thank you!

Answer 3

np :)