Find slope of line that contains (1,6) and (10,-9)

The slope formula for two pairs of coordinates is 2nd y value - 1st y value : 2nd x value - 1st x value.

Plugging your values in, you get:

(-9 - 6) : (10 - 1)

Which can be simplified to:

(-15) : (9)

So your slope would be - (15 / 9)