The y intercept is the y coordinate when x=0.
Use the formula y=mx+b.
y=5x+b
To do this, pick one of the points and substitute its points for x and y.
I chose (2,7):
7=5(2)+b
7=10+b
subtract 10 from both sides..
-3=b!
So the y intercept is -3.
The equation is y=5x-3! ^_^
