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(x₁ , y₁) = (2,1)
(x₂ , y₂) = (4,5)
m = (y₂ - y₁)/(x₂ - x₁)
= (5 - 1)/(4 - 2)
= 4/2
= 2
maka gradiennya adalah 2
=
= = 2