,

Slope is equal to the change in over the change in , or rise over run.

The change in is equal to the difference in x-coordinates (also called run), and the change in is equal to the difference in y-coordinates (also called rise).

Substitute in the values of and into the equation to find the slope.

Multiply by .

Subtract from .

The expression contains a division by The expression is undefined.

Undefined

Undefined

The slope of a perpendicular line is the negative reciprocal of the slope of the line that passes through the two given points.

The slope of a line perpendicular to a vertical line is zero.

Find the Slope of the Perpendicular Line to the Line Through the Two Points (6,7) , (6,-6)