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Math Help - SAT Math Question (Varies Directly)

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    SAT Math Question (Varies Directly)

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    Re: SAT Math Question (Varies Directly)

    Quote Originally Posted by johnbaptistcolbert View Post
    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
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