Homework Help: math

Posted by Evelyn on Wednesday, December 15, 2010 at 7:46pm.

Lily went for 8 rides at the county fair. Some rides were on the merry-go-round, and the rest were on the pirate ship. The total cost of all rides was $6.30. Each pirate ship ride cost $0.60, and each merry-go-round cost $0.90. How many pirate ship did Lily take?

math - Damon, Wednesday, December 15, 2010 at 8:03pm
x+y = 8
.6x + .9 y = 6.3

y = 8 - x

.6 x + .9(8-x) = 6.3

-.3x + 7.2 = 6.3

-.3 x = - .9

x = 3 pirate rides
so y = 5 merry go round rides

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