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7) $-6x + 6y = 6$ $-6x + 3y = -12$

Question

  1. $-6x + 6y = 6$ $-6x + 3y = -12$

Explanation:

Step1: Restar las dos ecuaciones

$$\begin{align*} (-6x + 6y) - (-6x + 3y) &= 6 - (-12)\\ -6x + 6y + 6x - 3y &= 6 + 12\\ 3y &= 18 \end{align*}$$

Step2: Resolver para $y$

$$ y = \frac{18}{3} = 6 $$

Step3: Sustituir $y=6$ en la primera ecuación

$$ -6x + 6(6) = 6 $$

Step4: Simplificar y resolver para $x$

$$\begin{align*} -6x + 36 &= 6\\ -6x &= 6 - 36\\ -6x &= -30\\ x &= \frac{-30}{-6} = 5 \end{align*}$$

Answer:

$x=5$, $y=6$