algebra

42 < –6d

A. d < –7
B. d < 36
C. d > –7
D. d < –48

i really need help with this i don't
get it

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asked by kells
  1. solve it just as you would an equation:

    42 = -6d
    -7 = d

    However, multiplying and dividing by negative values changes the direction of the inequality. So, you have

    42 < -6d
    7 < -d
    -7 > d or d < -7

    Since you can always add and subtract without changing the direction, the direction-switch is just a shorthand way to move items from one side to the other:

    42 < -6d
    42+6d < 0
    6d < -42
    d < -7

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    posted by Steve
  2. post it.

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    posted by Henry

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