Question

Louise buys 1 pack of pencils and 1 box of crayons for her son for $3.39. Elaine buys 7 packs of pencils and 8 boxes of crayons for her students for $25.88.

Answer 1

Explanation:

p+c=3.39, p=3.39-c

7p+8c=25.88, using p=3.39-c in this equation gives you

7(3.39-c)+8c=25.88

23.73-7c+8c=25.88

23.73+c=25.88

c=2.15, since p=3.39-c

p=3.39-2.15

p=1.24

So pencils cost $1.24 and crayons cost $2.15