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9th grade

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substitution for 5r-s=5 -4r+5s=17

  • 9th grade math -

    Rearrange first equation.

    s = 5r - 5

    -4r + 5s = 17

    Substitute 5r - 5 for s in the second equation and solve for r. Put that value in the first equation to solve for s. Check by putting both values in the second equation.

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