Post a New Question

Math, help needed

posted by .

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.

Answer This Question

First Name:
School Subject:

Related Questions

More Related Questions

Post a New Question