Solving Equations Using the Subtraction and Addition Properties of Equality: example 2.30

Write an equation modeled by the envelopes and counters, and then solve the equation:

Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.

Your turn

The book's Try It right after this example: same idea, new numbers. Only the answer is given.

Write the equation modeled by the envelopes and counters, and then solve the equation:

How did it go?

On the left, write $x$ for the contents of the envelope, add the $4$ counters, so we have $x + 4$ .	$x + 4$
On the right, there are $5$ counters.	$5$
The two sides are equal.	$x + 4 = 5$
Solve the equation by subtracting $4$ counters from each side.

On the left, write $x$ for the contents of the envelope, add the $4$ counters, so we have $x + 4$ .	$x + 4$
On the right, there are $5$ counters.	$5$
The two sides are equal.	$x + 4 = 5$
Solve the equation by subtracting $4$ counters from each side.