Step 1 :We can find $x$ by substituting the first equation into the second. From $-8x-20=4(-2x-5)$, we get $-8x-20=-8x-20$, which simplifies to $0=0$.
Step 2 :This means that the two equations are equivalent, and any value of $x$ will satisfy both equations.
Step 3 :To find $y$, we can substitute any value of $x$ into the first equation. For example, if $x=0$, then $y=-2(0)-5=-5$.
Step 4 :Thus, there are infinitely many solutions, and the solution set is $\{(x, -2x-5)\}$ for all real numbers $x$.