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2. 9y = 3x - 15 -> y = (1/3)x - (5/3), garis yg dejajar dengan grs tsb adalah y = (1/3)x + 2
3. 6y = -2x + 4 -> y = (-1/3)x + (2/3)
m1 = (-1/3), m2 = 3
jadi pers.garisnya y-(-4) = 3 * {x - 3}
y + 4 = 3x - 9
y = 3x - 13