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Math, help needed

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Kate bought 3 CDs and 1 DVD at a store. Her friend Joel bought 2 CDs and 2 DVDs. If Kate spent $20 and Joel spent $22, determine the cost of a CD and DVD.
~Please provide an explanation as well.
Please and thanks!

  • Math, help needed - ,

    3C + D = 20

    D = 20-3C

    2C + 2D = 22

    Substitute 20-3C for D in second equation and solve for C. Insert that value into the first equation and solve for D. Check by inserting both values into the second equation.

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