Definitions
A letter that represents an unknown number.
Solve for x:
x - 3 = 9
x = 12
Find the value of the expression if y = 2:
y + 9
= 11
What operation does 'more than' refer to?
Addition
What is a coefficient?
Solve for x:
x + 3 = 8
x = 5
Find the value of the expression if y = 3:
2y
= 6
What operation does 'less than' refer to?
Subtraction
What is an operator?
The symbol that tells us what to do.
Solve for x:
x - 4 = -10
x = -6
Find the value of the expression if y = 2:
5y - 4
= 6
What operation does 'sum of' refer to?
Addition
What is a constant?
A number by itself that does not change.
Solve for x:
5x = 30
x = 6
Find the value of the expression if y = 4:
2y + 14
= 22
What operation does 'product' refer to?
Multiplication
What is the difference between an expression and equation?
Expression: no equals sign
Equation: has equals sign
Solve for x:
x/3 = 7
x = 21
Find the value of the expression if y = 3:
6y/ 2
= 9
What operation does 'split between' refer to?
Division