Question

solve the system by substitution.

y = 3x + 18
y = 5x

Explanation:

Step1: Substitute $y=5x$ into first equation

$5x = 3x + 18$

Step2: Isolate $x$ term

$5x - 3x = 18$
$2x = 18$

Step3: Solve for $x$

$x = \frac{18}{2} = 9$

Step4: Solve for $y$ using $y=5x$

$y = 5\times9 = 45$

Answer:

$x=9$, $y=45$