Solving for a Variable (+/-)

Front

What is the equation to find out how much money Lori had before spending $15 if she has $38 left?

Back

38 = m - 15

Front

What operation do you perform to isolate the variable when solving the equation 38 = m - 15?

Back

Add 15 to both sides.

Front

What is the term for using the opposite operation to 'undo' an operation in an equation?

Back

Inverse operations.

Front

If Davi had a debt of $3 and now has $11, how do you find out how much money he had initially?

Back

Add the debt to the current amount: -3 + 11 = 14.

Front

How many apples did Lori have initially if she gave away 5 apples and has 19 left?

Back

19 + 5 = 24 apples.

Front

If Lori has 5 apples and Davi has 11 fewer apples, how many apples does Davi have?

Back

5 - 11 = -6 (Davi has 16 apples).

Front

What is the first step in solving the equation m - 15 = 38?

Back

Add 15 to both sides.

Front

What does it mean to isolate a variable in an equation?

Back

To get the variable alone on one side of the equation.

Front

What is the solution to the equation m + 5 = 20?

Back

m = 20 - 5 = 15.

Front

If you have the equation 2m = 10, what is the first step to solve for m?

Back

Divide both sides by 2.