SOLUTION: Dad spent 119 for 7 people in the family. How many adult tickets did he buy if adults tickets=21 and children=14.

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Question 898373: Dad spent 119 for 7 people in the family. How many adult tickets did he buy if adults tickets=21 and children=14.
Answer by josgarithmetic(39625) About Me  (Show Source):
You can put this solution on YOUR website!
Cost, 119
prices: a for adults, c for children
a+c=7 and 21*a+14*c=119

Neat system of two linear equations to solve.
system%28a%2Bc=7%2C21a%2B14c=119%29

Start with Elimination Method to get a value for a. Do this by subtracting 14 times the ticket equation from the cost equation.