Question

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solve the system by substitution.
y = 3x
y = -4x - 49

Explanation:

Step1: Substitute $y=3x$ into second equation

$3x = -4x - 49$

Step2: Solve for $x$

$3x + 4x = -49$
$7x = -49$
$x = \frac{-49}{7} = -7$

Step3: Find $y$ using $y=3x$

$y = 3\times(-7) = -21$

Answer:

$x=-7$, $y=-21$