(thanks to Maegan for typing it up!)
Variable-is a symbol for a number we don’t know. It is
usually a letter x or y.
Constant - A number on its own
Coefficient- A number used to multiply a variable. In
7x x is a variable, 7 is the coefficient
4 is coefficient
X is the variable
7 and 5 is constants
Term-either a single number or variable, or numbers and
variables multiplied together.
Expression- A group of terms separated by + and – signs 4x-7
Equation-Has an equal sign. Both sides have the same value.
Like Terms - Terms with the same variable and exponents x, 3x and 21x are like terms. 3q and q2 are not like terms.
Gather like terms- add all terms with the same variable together 6x, 2x, -1x . 7x.
Evaluate- substitute a # for the variables.
HW - Answer the following questions to hand in. You don't need to copy the questions but please answer in COMPLETE SENTENCES.
1. In the expression 3a + 2
a) What is the variable?
b) What is the constant?
c) What is the coefficient of a?
2. Are -5b and 12b like terms? Why or why not?
3. a) Make up an expression using the variable d, a coefficient of 5 and a constant of 10.
b) Make up an expression that has a variable k, a coefficient that is an odd number, and a constant that is a perfect square.
4. Evaluate the expression 3n + 1
Example: If n = 7 then 3n +1 would be 3 (7) + 1 which is 22.
a) n = 2
b) n = 6
c) n = 10
