Set up the Balance Scale X interactive as your teacher instructs you. Ignore any instructions in the interactive. Then complete the following.

Write an equation that represents the balance scale.

Can you add or subtract something from both sides of the balance scale to find the value of x that makes the equation true? Experiment with the Balance Scale X interactive to see if you can find the solution using this method.

What is the solution?

Substitute your solution for x in your equation to check your answer.

Use the addition property of equality to solve equations.

Apply the Property

Work Time

Apply the Property

Addition property of equality: If you add the same number to both sides of an algebraic equation or subtract the same number from both sides of an algebraic equation, the equations will be equivalent and the equations will have the same solution.

Look at the board to set up each problem in the Balance Scale X interactive. Ignore any instructions in the interactive. For each problem:

Write an equation that represents the balance scale.

Find the solution using the addition property of equality. Write down your solution steps.

Check your solution.

INTERACTIVE: Balance Scale X

Hint:

Try to get x by itself on one side of the balance scale.

How can you use substitution to check your solution?