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Rumus = y-y1/y2-y1=x-x1/x2-x1
y-(-7)/-6-(-7)= x-3/8-3
y+7/1=x-4/5
kalikan silang
5(y+7)=1(x-4)
5y+35=x-4
5y=x-4-35
5y=x-39
y=x-39/5
y=1/5x-39/5
Gradien (m)= 1/5 dan titik (-6,3)
Rumus = y-y1=m(x-x1)
y-3=1/5(x-{-6})
y-3=1/5x+6/5
5x(y-3)=(1/5x+6/5)×5
×5 krn penyebut 1/5x dan 6/5=5
5y-15=x+6
5y=x+6+15
5y=x+21 atau 5y-x-21=0