tolong ya nomor 9 pakai cara teriam kasih bukan langsung jawab sama nomor 8 sekalian

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Gradien 2 buah garis sejajar SAMA BESAR.

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Persamaan garis melalui (1,-2) dan (3,-7)

(y - y1)/(y2 - y1) = (x - x1)/(x2 - x1)
(y - (-2))/(-7 - (-2)) = (x - 1)/(3 - 1)
(y + 2)/(-5) = (x - 1)/2
Kalikan silang
2y + 4 = -5x + 5
2y = -5x + 1

8. Sama Besar

9.m= y2-y1/x2-x1 = -7-(-2)/3-1 = -5/2
y-y1=m(x-x1)
y+2=-5/2(x-1) (Dikali 2)
2y+4=-5x+5
2y=-5x+1