Step-by-step explanation:
So, a coordinate plane is made out of two axis, the x and the y. Through these, we have grid squares on the plane showing points. So, each square would be one point. To find the <u>rate of change, or slope,</u> you would have to use the formula:
y(#2) - y(#1)
------------------ = Divided by
x(#2) - y(#1)
This formula will calculate the rate of change. I will do the first one for you as follows.
The first point I would find would be (1,3). 1 space on the X-axis, 3 on the Y-axis.
To write a ordered pair to represent the point on the plane, use the (X,Y).
Then, I'd find the second point.
Following the second point, I would do the equation like so.
y(2) - 3
-----------------
x(2) - 1
See, I used the first points given as the last X and Y variables in the formula.
Hope this helps you out!
= 67