Question

How do you solve `3x+5y=7` and `2x-y=9`?

Answer 1

`x=4` & `y=-1`

Explanation:

`3x+5y=7` Eqn (1)
`2x-y=9` Eqn (2)
Multiply Eqn (2) by 5
`10x-5y=45` Eqn (3)

Adding Eqn (1) & (3)
`13x=52` or `x=4`
Substituting value of x in Eqn (2)
`8-y=-9` or `y=-1`