SOLUTION: A restaurant charges $7 for a regular meal and $5 for a child's meal. Both prices include tax. a family of 9 people spent $53 at the restaurant. How many regular meals and how many

Question 452619: A restaurant charges $7 for a regular meal and $5 for a child's meal. Both prices include tax. a family of 9 people spent $53 at the restaurant. How many regular meals and how many children's meals did they pay?
Answer by Love math(28) (Show Source): You can put this solution on YOUR website!
let d for adut, c for a child
53 =7d+5c
9 = d+c
9-d = c
sutitution c=9-d
53 =7d+5(9-d)
53 =7d+45-5d
53 = 2d +45
53-45 =2d
8= 2d
8/2=d
4 = d
d+c =9
4+c=9
c =9-4
c =5
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