Question

(online) solving systems by substituting
avaleen morin

solve the system of equations.
\

$$\begin{cases}4y = 20\\\\x - y = 7\\end{cases}$$

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Explanation:

Step1: Solve for $y$

Divide both sides by 4:
$\frac{4y}{4} = \frac{20}{4}$
$y = 5$

Step2: Substitute $y=5$ into second equation

Replace $y$ in $x-y=7$:
$x - 5 = 7$

Step3: Solve for $x$

Add 5 to both sides:
$x = 7 + 5$
$x = 12$

Answer:

$x=12$, $y=5$