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x1= -5
m = -2
persamaan garis lurus
y-y1 = m(x-x1)
(y-1)=-2(x-(-5))
(y-1) = -2 (x+5)
(y-1)=-2x -5
y=-2x-5+1
y=-2x-4
memotong sumbu x pada y=0
0=-2x-4
2x=-4
x=-4/2
x=-2
memotong sumbu x di (-2,0)