Explanation:
y = mx+ b
m is the slope = 5
you can get x,y from point (x,y); x=2, y=1
substitute all information we have to find b
1 = 5(2) + b
1 = 10 + b
1 - 10 = b
-9 = b
the function for line:
y = 5x - 9
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