Question

What are x and y if `4x - 5y = 40` and `2x + 10y=20`?

Answer 1

`x=10,y=0`

Explanation:

`:.4x-5y=40------(1)`

`:.2x+10y=20------(2)`

`:.(2)xx2`

`:.4x+20y=40------(3)`

`:.(1)-(3)`

`:.-25y=0`

`:.y=0`

substitute `y=0` in `(1)`

`:.4x-5(0)=40`

`:.4x=40`

`:.x=10`