Elimination Using Addition and Subtraction

Elimination Using Addition and Subtraction

By Omar Shishani

Multiple Choice

QUICK CHECK: Simplify the following expression.

$$7x\ -5x$$  

• 2x

• x

• 12x

• -2x

Multiple Choice

QUICK CHECK: Simplify the following expression.

$$4x-x$$  

• 3x

• 3

• 4

• 4x

Multiple Choice

QUICK CHECK: Simplify the following expression.

$$2y-8y$$  

• -6y

• 6y

• 10y

Multiple Choice

QUICK CHECK: Simplify the following expression.

$$4x-4x$$

• 0

• x

• 4

• 8x

Multiple Choice

Solve using elimination.

$$4x+9y=-6$$  

$$x+9y=12$$  

• ( -6 , 2 )

• ( 2 , -6 )

• ( -3 , 5 )

• ( -5 , 4 )

Multiple Choice

Solve using elimination.

$$-6x+6y=-18$$  

$$5x-6y=12$$  

• ( 6 , 3 )

• ( 3 , -6 )

• ( 4 , 5 )

• ( 7 , 3 )

Multiple Choice

Solve using elimination.

$$-3x-5y=11$$  

$$3x+9y=-15$$  

• ( -2 , -1 )

• ( 3 , 4 )

• ( -2 , 5 )

• ( 7 , 6 )

Poll

Which method is easier?

• Substitution

• Addition and Subtraction