Persamaan garis melalui titik A(-3,4)dan B(2,-5)adalah

diketahui:
A = (-3,4), x1 = -3 dan y1 = 4
B = (2,-5), x2 = 2 dan y2 = -5
keterangan * artinya kali.

persamaan garis (cara cepat):
=> (x1 - x2)y = (y1 - y2)x + [(x1 * y2) - (y1 * x2)]
=> (-3 - 2)y = (4 - (-5))x + [(-3 * (-5)) - (4 * 2)]
=> -5y = 9x + (15 - 8)
=>-5y = 9x + 7
jadi, persamaan garisnya adalah:
-5y = 9x + 7 atau 9x + 5y + 7 = 0