Question 620461
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Hi,
The Alexanders bought 9 movie tickets,{{{highlight(x)}}}Adult and {{{highlight(9-x)}}}Child's tickets for a total cost of $30.00. 
Each child's ticket costs $2 and each adult's ticket costs $4. 
How many child's tickets did the Alexanders buy?
  $4x + $2(9-x) = $30
       2x = 12
        x = 6, the number of adult tickets.  3 child's tickets
CHECKING our Answer***
   $24 + $6 = $30