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26 December, 22:19

A store owner spends 7x + 13 dollars on two orders of boxes of light bulbs, including shipping. If the store owner spent a total of $90 on both orders, how much does a box of light bulbs cost in dollars?

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  1. 26 December, 23:45
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    Well, I believe your equation would be ...

    7x + 13 = 90

    Now solve for x

    Subtract 13 from each side

    7x + 13 - 13 = 90 - 13

    7x = 77

    Divide each side by 7

    7x : 7 = 77 : 7

    x = 11

    A box of light bulbs costs 11 dollars
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