Question

What is the y-intercept (b value) of a line that is PERPENDICULAR to the line y = -x- 2and through

the point (-3,-7)

Answer 1

The y -intercept is the point (0, -4).

Explanation:

The slope of the perpendicular line = -1/m

= -1/-1 = 1.

So it is y = x + b.

To find b we substitute the point (-3, -7):

-7 = -3 + b

b = -7 + 3 = -4.

The y -intercept is the point (0, -4).