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y = 3/2x - 9 -> m = 3/2
persamaan garis:
y - y1 = m(x - x1)
y - (-1) = 3/2(x - (-4))
y+1 = 3/2 (x+4)
y = 3/2x + 6 - 1
y = 3/2x + 5
jadi, persamaan garisnya: y = 3/2x + 5