When Mr. J. Raff took his two children to the zoo, their tickets cost $8.75. The next family in line was Mrs. Ella Fant with Grandpa and the five Fant kids. Their tickets cost a total of $19.75. How much does the zoo charge for each adult and for each child?

A + 2K = 8.75

2A + 5K = 19.75

Change the first expression so that we can subtract the As

2A + 5K = 19.75

2A+4K = 17.50

If the signs are the same, subtract one expression from another

K = 2.25

substitute K into any expression to get A

A+4.50 = 8.75

Subtract 4.50

a=4.25

K=$2.50

A = $4.25