Question

How do you solve the following system: # 7x - y = 10 , 8x - y = 13 #?

Answer 1

`x=3` and `y=11`

Explanation:

`7x-y=10` `.................(i)`
`8x-y=13` `..................(ii)`

Subtract `(i)` from `(ii)`
`implies x=3`

Put `x=3` in `(i)`
`implies 7(3)-y=10`
`implies 21-y=10`
`implies y=11`
`implies y=11`