#### Parent Mathing Tip #11: Money

These tips give parents ideas for math exercises that will develop their child's math abilities. Today’s parent tip for “mathing” with your child focuses on money.

Welcome to Mathnasium’s Math Tricks series. Today we are solving linear equations in the form *ax + b = c*.

We can sometimes solve linear equations using *inspection*. When solving for *x*, we can think “something plus *b* equals *c*,” and “*a* times the number *x* equals that something.”

In some cases, it may be difficult to solve for *x* mentally. Instead, to solve for the *variable* *x*, we undo the operations in the reverse of the *order of operations*. That means we start by undoing the addition or subtraction first and then undoing the multiplication or division. Recall the **Law of Equations** tells us that operations done on one side of the equal sign must also be done on the other side of the equal sign to keep the equation in balance.

Follow the examples below to solve for the variable.

**Step 1: Undo the addition or subtraction on both sides of the equation.**

-3

-3

-3

6 – 6 = 0

**Step 1: Undo the addition or subtraction on both sides of the equation.**

11

11

11

-4 – 6 = -10

Now, with this strategy, you are ready to use this Mathnasium Math Trick to solve linear equations in the form *ax + b = c*. Click here for more practice problems, then check your answers here.

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