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___ = ____
x-x₁ x₂-x₁
y-2 5-2
___ = ___
x-4 -1-4
y-2 3
___ = ___
x-4 -5
3(x-4) = -5(y-2)
3x-12 = -5y+10
3x+5y = 10+12
3x+5y = 22
3x+5y-22=0 (A)