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21 December, 00:00

A student bought a book for $7 and a pen. The total cost was $9. Which of the following equations can be used to find the cost of the pen?

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Answers (2)
  1. 21 December, 01:25
    0
    7+x=9

    Step-by-step explanation:

    if you subtract 7 from both sides of this you will get x=2 so the pen is $2
  2. 21 December, 01:27
    0
    Solution:

    Total cost = $9

    Cost of book = $7

    Let the cost of pen be = x

    Thus,

    x+$7=$9

    x=$9-$7

    x=$2
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