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fenix001 [56]
3 years ago
9

X=2y=-7 -4x+3y=-7whats the answer?

Mathematics
2 answers:
Talja [164]3 years ago
8 0
\begin{cases} x+2y=-7 \ \ / *4\\ -4x+3y=-7 \end{cases}\\\\\begin{cases} 4x+8y=-28 \\ -4x+3y=-7 \end{cases}\\+-------\\11y=-35\ \ / :11\\\\y=-\frac{35}{11}

x+2y=-7 \\\\ x+2*(-\frac{35}{11})=-7\\ x+ (-\frac{70}{11})=-7\\\\ x =-7+\frac{70}{11}\\\\x =-\frac{77 }{11}+\frac{70}{11}\\\\x=-\frac{7}{11}\\\\Answer:\ \ \ \begin{cases}x=-\frac{7}{11}  \\  y=- \frac{35}{11} \end{cases}

Andreyy893 years ago
3 0
   x + 2y = -7 ⇒ -4x - 8y = 28
-4x + 3y = -7 ⇒ <u>-4x + 3y = -7</u>
                                <u>-11y</u> = <u>35</u>
                                 -11    -11
                                     y = -3 2/11
                 x + 2(-3 2/11) = -7
                       x - 6 4/11 = -7
                      <u>    +6 4/11    +6 4/11</u>
                                    x = -1 4/11
                              (x, y) = (-1 4/11, -3 2/11)
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Brilliant_brown [7]

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Step-by-step explanation:

x+35=3x+1

We move all terms to the left:

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We add all the numbers together, and all the variables

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We move all terms containing x to the left, all other terms to the right

-2x=-34

x=-34/-2

x=+17

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