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13 June, 13:11

The sum of 5x and 2x is at least 70

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  1. 13 June, 15:45
    0
    Sum means add

    5x+2x is at least 70

    is at least means >

    so it is

    5x+2x>70

    (5x+2x can be combined to get 7x and 7x>70 divide 7 get x>10)
  2. 13 June, 16:15
    0
    Set up an equality.

    "sum," "and" means to add, and "at least" means greater than or equal to.

    5x + 2x ≥ 70

    7x ≥ 70

    x ≥10

    Remember in inequalities you solve them almost like normal equations (you can add, and subtract the same) BUT if you multiply by a negative you must flip the sign. You don't have to flip the sign in this case because there are no negatives.
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