Algebraic Equations Addition and Subtraction

x + (-103) = - 80

• x = 23

• x = 27

• x = 17

• x = 24

The sum of a number and 8 is -13.  Find the number.

• 15

• 21

• -5

• -21

The combined ages of the 7th grade class is 1,582.  The combined ages of the 8th grade class is 34 more than the 7th grade.  Which equation can help you find the combined ages of the 8th grade class?

• 1,582 + 34 = h

• h = 1,582 - 34

• 1,582 - h = 34

• 34 = h + 1,582

When solving algebraic equations, to undo addition we use ______________ .

• division

• subtraction

• addition

• multiplication

When solving algebraic equations, to undo subtraction we use ______________ .

• subtraction

• division

• addition

• multiplication

The inverse operation of subtraction is addition.

• True

• False

The inverse operation for the equation shown is:

h + 18 = 34

• subtract 34

• subtract 18

• add 34

• add 18

What are the TWO basic rules for solving algebraic equations?

• Whatever you do to one side of the equation, you must do on the other side of the equation.

• Always add on both sides.

• Always start on the left side, regardless of where the variable is.

• Always do the inverse operation.

An example of a pair of INVERSE operations

• addition and subtraction

• addition and multiplication

• subtraction and division

• subtraction and multiplication

Which method can be used to solve the algebraic equation below? z - 6 = 13

• Subtract 6 from both sides of the equation

• Add six to both sides of the equation

• Subtract 13 from both sides of the equation

• Add 13 to both sides of the equation