What is the result of adding these two equations? \begin{aligned} -2x+7y &= -5 \\\\ -2x-4y &= 6 \end{aligned} −2x+7y

Question

What is the result of adding these two equations?
\begin{aligned} -2x+7y &= -5 \\\\ -2x-4y &= 6 \end{aligned}
−2x+7y
−2x−4y

=−5
=6

=4

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Josie 1 week 2022-01-15T14:53:35+00:00 1 Answer 0 views 0

Answers ( )

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    2022-01-15T14:55:25+00:00

    {-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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