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Math Help - Quick question about expressions

  1. #1
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    Quick question about expressions

    The answer is A but idk how its A... Please explain. Thanks!!
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    Re: Quick question about expressions

    Quote Originally Posted by asilvester635 View Post
    The answer is A but idk how its A... Please explain. Thanks!!
    20-\tfrac{4}{5}x\ge 16 is equivalent to 100-4x\ge 80.
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  3. #3
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    Re: Quick question about expressions

    Equivalently, 20- \frac{4}{5}\ge 16 is equivalent to 20\ge \frac{4}{5}x+ 16 (add \frac{4}{5}x to both sides) which equivalent to 20- 16= 4\ge \frac{4}{5}x (subtract 16 from both sides).

    Now multiply both sides by the positive number \frac{5}{4}:
    \frac{5}{4}(4)= 5\ge x.
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    Re: Quick question about expressions

    Thank you so much!!!
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