# Solving Simultaneous Equations – O Level Additional Mathematics Get our simultaneous equations free course based on the Singapore additional Math syllabus right now! This course consists of 3 video lectures and 1 worksheet (with complete worked solutions). Become good at simultaneous equations in just 4 short lessons.

Simultaneous equations are often a part of a question in A Math. You can solve simultaneous equations in any chapter in A Math. Hence, it is important to know this chapter well.

In the O Level A Maths syllabus, you are tested on solving simultaneous equations in two variables by substitution, with one of the equations being a linear equation. While solving simultaneous equations by substitution will solve almost all questions, I also share how to solve the equations by the elimination method. Sometimes, solving simultaneous equations using the elimination method may be easier, so I highly recommend knowing them as well. In fact, when you are in primary school, you have actually solved questions using the elimination method. Did you know that?  Find out in our free course below!

### Introduction to Simultaneous Equations

Firstly, why do we need to solve simultaneous equations? In this video, you’ll learn what are simultaneous equations and why do we need to solve them.

I also go through the 2 methods used for solving simultaneous equations – the substitution method and elimination method.

### Solving Simultaneous Equations by Substitution

You can solve almost all simultaneous equations using the substitution method. In this video, you will learn how to solve both linear and non-linear simultaneous equations. For A Maths at O level, you are expected to solve simultaneous equations in two variables by substitution, with (at least) one of the equations being a linear equation (i.e. the other equation can be a non-linear one).

You can solve simultaneous equations by substitution in a systematic manner. You can do this by following the 5 general steps which I’ve summarized below:

Watch this video here to learn how to apply these steps:

### Solving Simultaneous Equations by Elimination Method

In this video, you will learn how to solve simultaneous equations by elimination. While you can solve almost all questions with substitution, there are times when using this method is easier.

I also share that you had used this method when you were in primary school. Watch it to find out!

### Solve the Simultaneous Equations Yourself

Want to do well in Maths? Then you’ve got to practice! In lesson 4, you will be doing the worksheet. I’ve included complete worked solutions in the worksheet.