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there are people walking their dogs at a park. There are 30 heads and 68 feet at the park. Write out the algebraic equations for this problem. Use P to stand for the number of people and D to stand for the number of dogs.

  • algebra -

    D + P = 30, therefore D = 30-P

    4D + 2P = 68

    Substitute 30-P for D in second equation and solve for P. Insert that value into the first equation and solve for D. Check by inserting both values into the second equation.

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