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Verified answer
3y = - ax + 12m = - a/3
sejajar m1 = m2 = - a/3
pers garis
y - y1 = m (x - X1)
y + a = - a/3 (x - 8)
y = - a/3 x + 8a/3 - a (dikalikan 3 utk menghilangkan penyebut)
3y = - ax + 8a - a
3y + ax = 7a