Question

Me ayudan resolviendo
a) 5x + 2y = –3
3x + 2y = –1
b) x = 2
y – 3x = 0
c) 2x + y = –2
2x + y = 4
d) –3x + 2y = 5
–6x + 4y = 10
e) x + y = 4
2x + y = –2
f) 3x + y = 6
x – 3y = –1

Answer 1

Respuesta:

$\\c)\left \{ {{2x+y=-2} \atop {2x+y=4}} \right. \\\\\begin{bmatrix}2\cdot \frac{-2-y}{2}+y=4\end{bmatrix}\\\\\begin{bmatrix}-2=4\end{bmatrix}\\\\\\d)\begin{bmatrix}-3x+2y=5\\ -6x+4y=10\end{bmatrix}\\\\\begin{bmatrix}-6\left(-\frac{5-2y}{3}\right)+4y=10\end{bmatrix}\\\\\begin{bmatrix}10=10\end{bmatrix}\\\\x=-\frac{5-2y}{3}\\\\e)\begin{bmatrix}x+y=4\\ 2x+y=-2\end{bmatrix}\\\\\begin{bmatrix}2\left(4-y\right)+y=-2\end{bmatrix}\\\\\begin{bmatrix}8-y=-2\end{bmatrix}\\x=4-10\\x=-6, y =10$

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