Question 184977
4m+6h=740 multiply by 5
5m+4h=785 multiply by -4
20m+30h=3,700
-20m-16h=-3,140
-------------------------
14h=560
h=560/14
h=$40 is the cost of headphones.
4m+6*40=740
4m+240=740
4m=740-240
4m=500
m=500/4
m=$125 is the price of the MP3 unit.
Proof:
5*125+4*40=785
625+160=785
785=785