Simultaneous equations are two equations with two unknowns. They are called simultaneous because they must both be solved at the same time.
We talked about two methods for doing this.
Elimination is when you add the two equations or subtract the two equations. Before you do this you need to make sure there is one term that is the same in both equations (eg both equations contain 2x). Remember the rule Same Signs Subtract.
Substitution involves you rearranging one equation to make y or x the subject, then substituting this into the other equation.
Both methods will always work, but one may be quicker than the other.
Once you have two solutions (x and y) you can check your answers are right by substituting your answers into both equations.
If you’re not sure about any of this, the methods are explained on this website.
Here’s your homework sheet.