Why is this in Chemistry?
In order to solve system of equations using substitution, remember these two steps:
1. Isolate a variable that you think will have a simplified equation.
2. Plug-in this variable on the next equation.
Let's make the first system as an example.
On the first equation, let us isolate x on the left hand side.
Now that we have a value for x, we substitute that on the second equation.
Plugging that value of y on the first equation, we get:
Do the same with the second problem. Hope that helps.If you're having problems dealing with the second problem, don't hesitate to message me. :)