Vivian L. answered • 10/13/13

Microsoft Word/Excel/Outlook, essay composition, math; I LOVE TO TEACH

Hi Again Theresa;

Another great question!

(2,-5)

9y=x-18

Our first priority is to place this formula into the format of...

y=mx+b

The y must be completely isolated.

So...

9y=x-18

We will divide both sides by 9...

9y/9=(x/9)-(18/9)

y=(x/9)-2

The slope is 1/9.

The slope of the perpendicular line is -9.

The y-intercept, the value of b when x=0, may or may not be -2.

y=-9x+b

Let's plug-in the provided coordinate of (2,-5)...

-5=-9(2)+b

-5=-18+b

If we add 18 to both sides...

13=b

y=-9x+13