math

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

posted by Sasha
2. 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

posted by Reiny

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