Answer:
The first point is right in the origin, so it's (0,0)
Our second point is (2, 1)
Our first point (0,0) would look like if labeled
0(X1) , 0(Y1)
Our second point would look like if labeled
2(X2) , 1(Y2)
Order them to find the slope;
1 - 0 1
____ = ___, our slope for this is 1/2
2 - 0 2