Solve using substitution. $$ \begin{array}{l}y=-1 \ -x-2 y=4\end{array} $$

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Solve the system of equations $$ y=-1; -x-2y=4 $$.
Solve the system of equations by following steps:
- step0: Solve using the substitution method:
  $$\left\{ \begin{array}{l}y=-1\-x-2y=4\end{array}ight.$$
- step1: Substitute the value of $$y:$$
  $$-x-2\left(-1ight)=4$$
- step2: Simplify:
  $$-x+2=4$$
- step3: Move the constant to the right side:
  $$-x=4-2$$
- step4: Subtract the numbers:
  $$-x=2$$
- step5: Change the signs:
  $$x=-2$$
- step6: Calculate:
  $$\left\{ \begin{array}{l}x=-2\y=-1\end{array}ight.$$
- step7: Check the solution:
  $$\left\{ \begin{array}{l}x=-2\y=-1\end{array}ight.$$
- step8: Rewrite:
  $$\left(x,yight) = \left(-2,-1ight)$$
The solution to the system of equations using substitution is $$ (x,y) = (-2,-1) $$.
$$ (x,y) = (-2,-1) $$

Solve using substitution.

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