Hello!
To solve for the slope of a line using two points, you use the formula y2-y1/x2-x1. Our ordered pairs can represent either the 1s or the 2s and the slope will still be the same.
Let’s start with (2,12) representing (x1,y1) and (4,20) represent (x2,y2). We plug these into the equation and find our answer.
20-12/4-2
8/2
4
Just go check that our answer is correct, let’s switch the ones and twos.
12-20/2-4
-8/-2
4
The slope of this line is D) 4.
I hope this helps!