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Verified answer
Kelas 8 MatematikaBab Persamaan Garis
(y - y1)/(y2 - y1) = (x - x1)/(x2 - x1)
(y - 2) / (-6 - 2) = (x - 3) / (-1 - 3)
(y - 2) / -8 = (x - 3) / -4
** -8 : -4 = 2 **
y - 2 = 2 (x - 3)
y = 2x - 6 + 2
y = 2x - 4
x1 , y1 dan x2 , y2
Rumus cepat :
y - y1 / y2 - y1 = x - x1 / x2 - x1
y - 2 / -6 - 2 = x - 3 / -1 - 3
y - 2 / -8 = x - 3 / -4
kali silang
y - 2 (-4) = x - 3 (-8)
-4y + 8 = -8x + 24
8x - 4y = 24 - 8 >>> Dipindah ruas
8x - 4y = 16 ->>> Persamaan 1
_________÷ 4
2x - y = 4 ->>> Persamaan 2
Jadi, persamaan :
8x - 4y = 16
2x - y = 4
Semoga bermanfaat ^_^