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Alex
3 years ago
7

{−2x+7y=−7 −5x+14y=−7

Mathematics
2 answers:
UkoKoshka [18]3 years ago
8 0

Answer: x=-7, y=-3

Step-by-step 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

Sati [7]3 years ago
3 0

Answer: x=7, y=2

Step-by-step 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

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