Step-by-step explanation:
work is shown and pictured
Answer:
The number of adults is 
Step-by-step explanation:
Let
x------> the number of children
y------> the number of adults
we know that
-------> equation A
-------> equation B
Multiply equation A by 
-------->
------> equation C
Adds equation B and equation C

=(-17) - 4
=(-17) + (-4)
=(-21)
1/2 divide by 3 or 1/[2(3)] which will be equal to 1/6
This is all I got sorry if it don’t help