Answer:
They made a sales for $514
Explanation:
Represent Adult with A
Represent Children with C
Given
Friday Night: 83A + 42C = 874
Saturday Night: 102A + 67C = 1151
Required
Determine 48A + 26C


Make C the subject in the first equation



Substitute this for C in the second equation


Multiply through by 42



Collect Like Terms


Solve for A


Recall that





Solving for 48A + 26C



Hence, they made a sales for $514