Question

{−2x+7y=−7
−5x+14y=−7

Answer 1

Answer:
`x=-7`,
`y=-3`

Explanation:

`\left \{ {-2x+7y=-7} \atop {-5x+14y=-7} \right.`

multiply 2 at
`-2x+7y=-7`

`-4x+14y=-14`

subtract
`-4x+14y=-14` and
`-5x+14y=-7`

`x=-7`

put
`x=-7` at
`-2x+7y=-7`

`7y=-21, y=-3`

Answer 2

Answer: x=7, y=2

Explanation:

1. -2(-2x+7y=-7) -> 4x-14y=14

2. 4x-14y=14

-5x+14y=-7

3. -x = 7, x=7

4. -5(7)+14y=-7

5. -35+14y=-7

6. 14y=28, y=2