Keirrawelch
Answered

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

Sagot :

Lilith
[tex]\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}[/tex]

[tex] 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} [/tex]

Panoyin
   x + 2y = -7 ⇒ -4x - 8y = 28
-4x + 3y = -7 ⇒ -4x + 3y = -7
                                -11y = 35
                                 -11    -11
                                     y = -3 2/11
                 x + 2(-3 2/11) = -7
                       x - 6 4/11 = -7
                          +6 4/11    +6 4/11
                                    x = -1 4/11
                              (x, y) = (-1 4/11, -3 2/11)
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