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Verified answer
Gradien garis y = -2/3x1 = 3
y1 = -2+a
x2 = a
y2 = -4
m =
kali silang
(-2-a) x 3 = (a-3) x (-2)
-6 - 3a = -2a + 6
-6 - 6 = -2a + 3a
-12 = a
a = -12