Vocabulary
A letter used to represent an unknown number.
What is a variable?
Write an expression for "five more than x."
What is x + 5?
The symbol that tells us two expressions are equal.
What is the equal sign (=)?
Solve x + 9 = 14.
What is x = 5?
How many terms are in 4x + 2 - 8 - 3y + 9?
What is 5 terms?
A complete number sentence with an equal sign.
What is an equation?
Evaluate x + 7 when x = 3.
What is 10?
Is x + 4 an expression or an equation?
What is an expression?
Solve x - 17 = 3.
What is x = 20?
Name the coefficients in 5x + 2y + 9.
What are 5 and 2?
An incomplete number sentence that does not contain an equal sign.
What is an expression?
The constant in 4x + 12.
What is 12?
Is x + 4 = 10 an expression or an equation?
What is an equation?
Solve 5x = 75.
What is x = 15?
Simplify 2x + 5 - x + y - 2.
What is x + y + 3?
Opposite operations used to solve equations.
What are inverse operations?
Simplify: 3x + 2x.
What is 5x?
To keep an equation balanced, you must do this to both sides.
What is perform the same operation on both sides?
Solve x ÷ 4 = 12
What is x = 48?
Check Morgan's answer: She says 4x = 20 and x = 6.
Is she correct? No, because 4(6) = 24, not 20.
In 5x + 8, the number 5 is called this.
What is a coefficient?
Simplify: 8x + 7 - 3x + 8.
What is 5x + 15?
In the equation 6 + x = 15, the unknown quantity is represented by this.
What is x?
Solve 8 + x = 23.
What is x = 15?
Simplify 4x + 8 - x + 9, then evaluate when x = 6.
What is 35? (3x + 17, then substitute 6.)