A number, variable, or product of numbers and variables separated by + or - signs.
What is a Term?
Simplify 5x + 2X
7x
Simplify: 3+2*5
13
Evaluate 3x + 4
when x = 2
10
Write an expression:
3 more than a number
x + 3
The number multiplied by a variable in a term.
What is a coefficient?
Simplify:
4y+6-y
3y+6
Simplify: (8 - 2)*4
24
Evaluate 2n - 5
when n = 8
11
Write an expression:
7 less than twice a number
2x - 7
A number without a variable; its value does not change.
What is a constant?
Simplify:
8p+2p-8
10p - 8
Simplify: 6 + 3^2 *2
24
Evaluate 4(a + 3)
when a = 5
32
Write an expression:
The cost of n tickets at $4 each plus $2
4n + 2
What is simplifying.
Which terms are alike?
3a+4b+6+7a-2
Terms 3a and 7a; terms 6 and -2
Simplify: (10 - 4) / 2 + 3 * 2
11
Evaluate 5x - 2y
when x = 4
and y = 3
14
Write an expression:
Area of a rectangle with length 3 units more than the width
Area = w*(w+3)
Give an example of an equivalent expression.
example: 3(x + 2) --> 3x + 6
Explain why -3x+5 and 5x-3 are not like terms.
They don't have the same var
What ensures everyoe gets the same, correct result for an expression?
Following the Order of Operations.
How does substitution help solve real-world problems?
It lets you replace a variable with a know value to find the total or cost.
Explain how you know if two expressions are equivalent
They give the same result for all values of the variable.