Question

two cassettes and three CDs cost $175 while four cassettes and one cd cost $125. Given that one cassette costs 5x and one cd costs 5y , write two equations in x and y to represent the information.

Answer 1

The first equation is

`2*5x+3*5y=175\rightarrow 10x+15y=175`
The second equation is

`4*5x+5y=125\rightarrow 20x+5y=125`