Question

the system of equations tells you that y is equal to -3, so thats the y - value in our system. to find the value of x in our system, we can substitute -3 for y in the second equation. do that now.
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$$\begin{cases}y = -3\\\\x = -3y + 5\\end{cases}$$

$x = -3(\square) + 5$

Explanation:

Step1: Substitute y = -3 into equation

$x = -3(-3) + 5$

Step2: Calculate the product first

$-3(-3) = 9$

Step3: Compute final x value

$x = 9 + 5$

Answer:

The value to fill in the box is $\boldsymbol{-3}$, and the value of $x$ is $\boldsymbol{14}$