Solving equations

For purposes of this course, we can consider an equation with one variable solved if the variable is alone on the left-hand side and does not appear on the right-hand side.

Here's a list of techniques for solving equations:

There are always more techniques, some of which are still being discovered.

A linear equation is an equation whose sides are both linear expressions. Linear equations in one variable can always be solved using this method:

At this point, you should have the answer, with the variable equal to a constant. Failing that, you might have a constant statement (with no variable in it), which will be either true or false; then that (‘True’ or ‘False’) is your answer.

Inequalities are solved in the same way as equations, except for this important point: If you multiply or divide both sides by a negative number, then you must swap the direction of the inequality.


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