X=2y=-7 -4x+3y=-7whats theanswer?
\(\begin{cases} x+2y=-7 \ \ / *4\\ -4x+3y=-7 \end{cases}\\\\\begin{cases} 4x+8y=-28 \\ -4x+3y=-7 \end{cases}\\+-------\\11y=-35\ \ / :11\\\\y=-\frac{35}{11}\)\(x+2y=-7 \\\\ x+2*(-\frac{35}{11})=-7\\ x+ (-\frac{70}{11})=-7\\\\ x =-7+\frac{70}{11}\\\\x =-\frac{77 }{11}+\frac{70}{11}\\\\x=-\frac{7}{11}\\\\Answer:\ \ \ \begin{cases}x=-\frac{7}{11} \\ y=- \frac{35}{11} \end{cases}\)
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)
