The monthly incomes of Aryan and Babban are in the ratio 3 : 4 and their monthly expenditures are in the ratio 5 : 7. If each saves Rs. 15000 per month, find their monthly incomes using matrix method. This problem reflects which value?

Explanation

`3x−5y=15000...(1)`

`4x−7y=15000...(2)`

`[[3, -5], [4, -7]][[x], [y]]=[[15000], [15000]]`

`[[1, 0], [0, 1]][[x], [y]]=[[30000], [15000]]`

`x=30000`