math

posted by Sasha

4. Thomas is at a store buying school clothes. T-shirts are on sale for $13 each and jeans are on sale for $18 each.
a) Write an equation that represents the total cost for x T-shirts and y pairs of jeans.

I need help with a..



b) Thomas bought six T-shirts and his total bill came to $168. How many pairs of jeans did he buy? Show all your work.

$13 x 6 (T) = $78.00
$18 x 5 (J) = $90.00
$90.00 + $78.00 = $168.00

  1. Sasha

    please help.

  2. Reiny

    x and y are defined in the question, so the cost equation would be

    cost = 13x + 18y

    so for b) you know cost = 168, x = 6

    168 = 13(6) + 18y
    168 = 78 + 18y
    90 = 18y
    y = 90/18 = 5
    He bought 6 t-shirts and 5 pairs of jeans

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