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An office supply store sells pens for $3 and notebooks for $5. Before school started, the store sold 12 more pens than notebooks and made $324. Which system of equations could be used to find the number of pens, p, and notebook, n that the store sold that day?

  • algebra -

    P = N + 12

    5N + 3P = 324

    Substitute N+12 for P in second equation and solve for N. Insert that value into the first equation and solve for P. Check by inserting both values into the second equation.

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