Question

How do you solve the system of equations `5x + y = 9` and `- 10x + 7y = 18`?

Answer 1

`x=1,y=4`

Explanation:

Multiplying the first equation by `2` and adding to the second:
`9y=36` so `y=4`
plugging this in the first equation:
`5x+4=9` so `x=1`