Question

Using the given points and line, determine the slope of the line.
(1, 2) and (2, 1)

Answer 1

-1

Explanation:

To find the slope of a line given two points, you can use
`(y_2-y_1)/(x_2-x_1)` where
`(x_1,y_1)` and
`(x_2,y_2)` are points on the line.

Or you could just line up the points vertically and subtract them vertically, then put 2nd difference over first.

Like so:

( 2 , 1 )

-( 1 , 2 )

--------------------

1 -1

So the slope is -1/1 or just -1.