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m = (y₂ - y₁)/(x₂ - x₁)
= (25 - 0)/(- 20 - 0)
= - 25/20
= - 5/4
m = y₂ -y₁
x₂ -x₁
m = 25 - 0
-20 -0
m = 25
-20
m = -5/4
Jadi, gradiennya adalah -5/4.