If the point (3, 5) lies on the graph of the equation 3y = ax + 9, find the value of a.
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Putting x = 3, y = 5 in the given equation, 3 x 5 = a x 3 + 9 ⇒ 3a + 9 = 15 ⇒ a = 2
If the point (3,4) lies on the graph of the equation 3y=ax+7, find the value of a?