
Walter B. answered 10/31/16
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Let C be the number of child's tickets sold and A be the number of adult tickets sold.
Since the total sold was 180 tickets; C + A = 180; our first equation
Since the theater charges $4.5 per child's ticket and $8 for an adult ticket and there were $1090 in total receipts
4.5C + 8A = $1090
Solving first equation for A yields: A=180 - C
Substitute the value of A into the second equation
4.5C + 8 * (180-C) = $1090
4.5C + 8*180 - 8*C = 1090
-3.5C + 1440 = 1090
-3.5C = 1090 - 1440
-3.5C = -350
C = 100
Therefore A = 180 - C= 180 - 100 = 80; or they sold 100 children's tickets and 80 adult tickets,
Hope this helps.
Walter