Can you help explain this to me, Iām so lost

Given:
The equation is,
[tex]-x-4y=-10[/tex]Explanation:
Substitute 3 for x and 2 for y in the equation to check for the solution.
[tex]\begin{gathered} -3-4\cdot2=-10 \\ -3-8=-10 \\ -11\ne-10 \end{gathered}[/tex]Point (3,2) not satisfy the equation. So point (3,2) is not a solution of equation