Question

1. x - 2y = 0\\2x - 5y = -4

Explanation:

Step1: Isolate $x$ from first equation

$x = 2y$

Step2: Substitute $x=2y$ into second equation

$2(2y) - 5y = -4$

Step3: Simplify to solve for $y$

$4y - 5y = -4 \\
-y = -4 \\
y = 4$

Step4: Substitute $y=4$ back to $x=2y$

$x = 2\times4 = 8$

Answer:

$x=8$, $y=4$