Question

What is the slope of a line perpendicular to y=-x?

Answer 1

Answer:  C) 4/7

Explanation:

The given equation is in the form y = mx+b with slope m = -7/4

Take the negative reciprocal of this to get 4/7. We simply flip the fraction and the sign (from negative to positive).

Note that multiplying any original slope with its perpendicular counterpart, will always get you -1

(-7/4)*(4/7) = -1

This applies to lines that are not vertical and not horizontal.

Answer 2

Answer:

C.

Step-by-step explanation:

The slope of the given line is -7/4

Let the slope we want be m :

Then m * -7/4 = -1        ( as the slopes of perpendicular lines have  a product of -1)

m = -1 / -7/4

= 1 * 4/7

= 4/7.