Use the grid to determine what points are on line 1. There are many choices to pick from, but we only need 2 points. Two of those points are (0,-1) and (1,1)
Use the slope formula to find the slope of this line
m = (y2-y1)/(x2-x1)
m = (1-(-1))/(1-0)
m = (1+1)/(1-0)
m = (2)/(1)
m = 2
The slope is 2
A slope of 2 is the same as saying 2/1, meaning we go up 2 and over to the right 1 each time.
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We'll use the same idea for line 2
Two points on this line are (0,2) and (1,1)
m = (y2-y1)/(x2-x1)
m = (1-2)/(1-0)
m = -1/1
m = -1
The slope is -1
slope = -1/1 means we go down 1 and over to the right 1 each time.