Free sample · Secondary E-Math

Linear equations in one unknown

Isolate x

x

by undoing addition or subtraction first, then undoing multiplication or division.

I Do

Worked example

Solve 2x + 3 = 11 $2 x + 3 = 11$ .

Subtract 3 $3$ from both sides (undo the +3 $+ 3$ ): 2x = 8 $2 x = 8$ . Divide both sides by 2 $2$ (undo the imes 2 $im es 2$ ): x = 4 $x = 4$ .

We Do

Try this step

Solve 3x - 5 = 7 $3 x - 5 = 7$ . What is x $x$ ?

You Do

On your own

Solve 5x + 1 = 16 $5 x + 1 = 16$ . What is x $x$ ?

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