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x1= 5 y1= 3
x2= 1 y2= 1
m = 1/2
y = mx - ( mx₁ - y₁ )
y = 1/2x - ( 5/2 - 3 )
y = 1/2x + 1/2
2y = x + 1
x - 2y + 1 = 0