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1 August, 22:33

Lya took one hour to drive from his apartment to Philips Arena and back. The return drive took 8 minutes less than the trip to the arena. If x represents the time it took Ilya to drive from his apartment to the arena, which equation would you use to determine how long he drove each way?

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  1. 1 August, 23:01
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    An hour is 60 minutes.

    The trip to the arena + The return drive = 60 mintues.

    Since the return drive is 8 minutes shorter, if you added 8 minutes it would be the same length as the trip to the arena.

    The return drive + 8 minutes = The trip to the arena

    Let's represent these two equations with variables.

    x + r = 60

    r + 8 = x

    What we do now is use substitution. Since r + 8 = x, we can replace x from the first equation with r + 8.

    x + r = 60

    r + 8 + r = 60

    2r + 8 = 60

    2r = 52

    r = 26

    Then use r in an earlier equation to find a.

    r + 8 = x

    26 + 8 = x

    x = 34
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