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College Math

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I need help solving these problems by using the substitution problem

  • College Math -

    substitution is a method, not a problem (though it appears to be a problem for you! :-)

    taking the first equation, solve for x or y:

    x = (16+3y)/2

    now "substitute" that into the other equation

    5(16+3y)/2 + 2y = 21
    80+15y + 4y = 42
    19y = -38
    y = -2
    so, x = (16-6)/2 = 5

    check that (5,-2) fits both original equations, just to be sure

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