Question

3 pairs of jeans and 6 shirts costs 104.25 dollars. The cost of 4 pairs of jeans and 5 shirts is 112.15 dollars. Find the cost of each pair of jeans and each shirt?

Answer 1

j=16.85

s=8.95

Explanation:

j=jeans s=shirt

3j+6s=104.25

4j+5s=112.15

working:

3j+6s=104.25 dollars

4j+5s=112.15 dollars

(get j to be the same)

12j+24s=417 dollars

12j+15s=336.45 dollars

(subtract them)

9s=80.55 dollars

s=8.95 dollars

(substitute in)

(3 x j)+(6x8.95)=104.25 dollars

3 x j= 104.25-(6x8.95)

j=50.55/3 (50.55 divided by 3)

j=16.85 dollars

substitute in to double check

(3 x 16.85) + (6 x 8.95) = 104.25 dollars

check with the other equation and it works also, so that must be the values of j and s (jeans and shirt)

(4 x 16.85) + (5 x 8.95)=112.15 dollars

j=16.85

s=8.95