Solve using Ax+By=C

Question

a store is having a sale on walnuts and chocolate chips. For 4 pounds of walnuts and 8 pounds of chocolate chips, the total cost is $21. for 2 pounds of walnuts and 3 pounds of chocolate chips, the total cost is $9. find the cost for each pound of walnuts and each pound of chocolate chips.

Answer 1

4w + 8c = 21

2w +3c = 9

4w + 6c =18

2c =3

c = $1.50 per pound for chips

w = $2.25 per pound for walnuts