# How do you find the slope that is perpendicular to the line # y= -1#?

##### 1 Answer

Jun 22, 2016

#### Answer:

It is undefined.

#### Explanation:

The slope

#m = (Delta y)/(Delta x) = (y_2-y_1)/(x_2-x_1)#

The line

#((-1)-(-1))/(1-0) = 0/1 = 0#

Alternatively, simply note that

#y = 0x+(-1)#

which is in standard slope intercept form:

#y = mx+b#

with slope

If a line has non-zero slope

The line