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Quote: Originally Posted by johnbaptistcolbert http://gyazo.com/6057d82d260ec57b74f180962417ae6e.png Well, y varies directly with x means that y = kx Thus when y = 8 and x = a we get 8 = ka And when y = 12 and x = a + 10 we get 12 = k(a + 10) Two equations, two unknowns. Can you finish from here? -Dan