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algebra

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what is 4p+3q=36
9p+6q=78 ?

  • algebra -

    4p+3q=36 (1)
    9p+6q=78 (2)
    You want to eliminate either the p's or q's to solve for one. Eliminating the q's is easier because you only have to change one equation. Multiplying (1) by -2...
    -8p-6q=-72 (3)
    9p+6q=78 (2)
    Add the equations together.
    p=6
    Now substitute p=6 in either equation 1 or 2 to figure out what q equals.

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