We have the next information
616 tickets were sold
x= adult tickets
y= student tickets
So we have the next equations
x+y=616
y=x+66
so we need to find x, substitute the second equation in the first equation
[tex]x+x+66=616[/tex]then we need to isolate the x
[tex]\begin{gathered} 2x+66=616 \\ 2x=616-66 \\ 2x=550 \\ x=\frac{550}{2} \\ x=275 \end{gathered}[/tex]then for y, we substitute the value of x in the second equation
[tex]y=275+66=341[/tex]adult tickets =275
student tickets= 341
