2014-10-14T17:30:58-04:00
if its \$12 (i use american dollars- it gets the same answer) per child
and 16 for every adult ... and the zoo brings in 4464\$ total then
12c+16a=4464

put that into a function and solve using elimination

12c+16a=4464
c+a=321

Multiply-     -12(c+a=321) and you get -12c-16a=-3852
Both c's cancel out so it's just
16a=4464
-12a=3852

You add each together (the 16 and -12, and the 4464 and the 3852)

4a=612
divide both by 4

612/4= 153
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