Question

How do you solve 3x + 7y = 5 and 5x - 9y = -5?

Answer 1

`x=5/31` `y=20/31`

Explanation:

By addition
`8x-2y=0`
`8x=2y`
`y=4x`

So `3x+7(4x)=5`

`31x=5`
`x=5/31`

Since `y=4x`
`y=4*5/31=20/31`