Costforeachpoundofchocolatechips:$

Question

A store is having a sale on chocolate chips and walnuts. For 8

 pounds of chocolate chips and 3

 pounds of walnuts, the total cost is $21

. For 2

 pounds of chocolate chips and 5

 pounds of walnuts, the total cost is $18

. Find the cost for each pound of chocolate chips and each pound of walnuts.

Costforeachpoundofchocolatechips:$

Costforeachpoundofwalnuts:$

Answer 1

8c + 3w = 21

2c + 5w = 18

Multiply the second equation by -4:

8c + 3w = 21

-8c - 20w = -72

Add the equations and solve for w, then solve for c.