$6.50(c + 18) = $6.50c + $117.00 a. the cost of attending a concert for c groups of people for $6.50 each. b. the amount for movie tickets for c adults when the cost is $6.50 more than $117.00 each. c. the amount of zoo admission for $6.50 more than c and $117.00. d. the cost of a birthday package at the theater with a base cost of $117.00 plus $6.50 per child.

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So the first thing we do is to multiply the top equation by 3. the reason i want to do this is i notice there will be a 6y on both equations and can possibly add/subtract them. so we get 6y = -3x + 27. adding that and the second equation we get 6x = 27-15 which is 12. divide by 6 and we get 2. ∴ x = 2. substituting 2 into the first equation we get 2y = -2 + 9 which is 7. divide by 2 and we get 7/2. ∴ y = 7/2, x = 2.