Most equations require more than one step to find the solution. In this lesson we are going to cover two-step equations. Two-step equations are equations that can be solved in two steps. These equations can be written in form of:
where x is the unknown variable, a is the coefficient and b and c are numbers. The coefficient can not be 0 or 1.
Note that we don’t have to follow this order, but it makes the calculation a lot easier.
Let’s get started with some examples, one of each type of the two-step equation.
This example can be solved in following steps:
● As we already said, it is a lot easier if we follow the order of operations described above. That means that we should subtract 5 from both sides first.
● The result of the previous step is a one-step equation. Now we only need to divide both sides with 2 to get the result for x.
● The result is .
Note that in this example we could have done division first and then subtraction, but it would make the solving of the equation more difficult since we would have to deal with fractions and it is easier to deal with regular numbers.
The example above can be solved in steps similar to the previous example:
● First we need to add 8 to both sides. The resulting equation is:
●In this step we only need to divide both sides with 4.
The result is .
Look at this example that you need to divide to get the solution x:
● In this step we are going to multiply the equation by 3 and get the result.
The result is x=15.
In this example, the x:3 could also be written as a fraction like but the process of solving the equation would be the same. So, if we get an equation that is written in form of the process of solving would be the same as in the example given above because is the same as x : a.
Two-step equations worksheets
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