Question

solve the system by substitution.

$y = -2x$
$y = 5x - 21$

answer attempt 1 out of 2
(\boxed{\space}, \boxed{\space})$

Explanation:

Step1: Substitute $y=-2x$ into second equation

$-2x = 5x - 21$

Step2: Isolate $x$ terms

$-2x - 5x = -21$
$-7x = -21$

Step3: Solve for $x$

$x = \frac{-21}{-7} = 3$

Step4: Substitute $x=3$ into $y=-2x$

$y = -2(3) = -6$

Answer:

$(3, -6)$