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y-y1/y2-y1= x-x1/x2-x1
y-(-1)/2-(-1) = x-5/-4-5
y+1/ 3 =x-5 / -9
-9y-9 = 3x - 15
9y + 3x =6
jika memotong sumbu x berarti y=0
maka masukan dalam persamaan
9.0 + 3x = 6
3x =6
x=2
semoga membantu