posted by Chelsea .
Miguel sells 77 to a barbeque, for a total of $443. If the tickets cost $7.00 for adults and $5.00 for children, how many of each ticket did he sell?
Let x = adult's tickets and y = children's tickets
x + y = 77
Therefore, x = 77 - y
7x + 5y = 443
Substitute 77 - y for x in the second equation and solve for y. Put value into first equation to find x. Check by putting both into the second equation.
I hope this helps.