Question

question
solve the system by substitution.
$x = y$
$x - 2y = 7$

Explanation:

Step1: Substitute $x=y$ into second equation

$y - 2y = 7$

Step2: Simplify to solve for $y$

$-y = 7 \implies y = -7$

Step3: Substitute $y=-7$ into $x=y$

$x = -7$

Answer:

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