P1 = (8, 4)
P2 = (17, 13)
1.- Find the slope
m = (y2 - y1) / (x2 - x1)
m = (13 - 4) / (17 - 8)
m = 9 / 9
m = 1
2.- Find the equation of the line
y - y1 = m(x - x1)
y - 4 = 1(x - 8)
y - 4 = x - 8
y = x - 8 + 4
y = x - 4
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