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m = -x/y
m = -2/3
persamaan garis:
y-y1 = m (x-x1)
y-(-3) = -2/3 (x-2)
y+3 = -2/3x - (-4/3)
____________________ x3
3y+9 = -2x + 4
3y+2x+(9-4) = 0
3y+2x+5 =0