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umka21 [38]
3 years ago
11

What is the result of adding these two equations?

Mathematics
1 answer:
Maru [420]3 years ago
8 0

{-2x + 7y = -5

{-2x - 4y = 6              | · (-1)

{-2x + 7y = -5

{2x + 4y = -6               (+)

----------------------------------

-2x + 2x + 7y + 4y = -5 + (-6)

11y = -11          | : 11

y = -1

{y = -1

{2x + 4y = -6

{y = -1

{2x + 4 · (-1) = -6

{y = -1

{2x - 4 = -6       | + 4

{y = -1

{2x = -2              | : 2

{y = -1

{x = -1

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