Answer:
The number of adults who went to the zoo was 21 and the number of children was 105.
Step-by-step explanation:
The complete question is
The Jurassic Zoo charges $5 for each adult admission and $3 for each child. The total bill for the 126 people from a school trip was $420. How many adults and how many children went to the zoo?
Let
x -----> number of adults
y ----> number of children
we know that
[tex]x+y=126[/tex] ------> equation A
[tex]5x+3y=428[/tex] ----> equation B
Solve the system by graphing
The solution is the intersection point both graphs
The solution is the point (21,105)
see the attached figure
therefore
The number of adults who went to the zoo was 21 and the number of children was 105.
