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(x-5)(x-1)
jadi, jika x=1 maka y=0
jika x=5 maka y=0
cari gradien,
2x-y+6=0
y=2x+6
karena sejajar
m1=m2=2
persamaannya kita ambil salah satu titik (1,0) dan gradien(m)=2:
y-y1=m(x-x1)
y-0=2(x-1)
y=2x-2
2x-y-2=0