Variables and Expressions
the sum of a number x and 20
x + 20
8 + 12 - 27 =
-7
46 + 5 * 4 =
66
3x + y + 4x
7x + y
When graphing a function the x axis is the _________ variable
independent
19 less a number z
19 - z
4 + 16 * 2 - 8 =
28
90 / 10 * 12 + 4 =
112
8x - 3x + 9y - 4y
5x + 5y
Which Property is shown in the examples below?
x + y = y + x
4 + 5 = 5 + 4
Commutative Property
21 less than the product of 4 and a number n
4n - 21
8 * 2 + 18 / 3 + 3 =
25
18 * 4 / 9 * 10 =
80
12x + 7y - 4x + 2y
8x + 2y
An example that shows that that a conditional “if,then” statement is not true is called what?
a counter example
The product of a number t and 7 increased by 9
7t + 9
5(9 + 7) + 42 =
96
(12-5)2 - 4 * 12 =
1
4x + 8y + 2z - x - 3y
3x + 5y + 2z
Which property is shown in the examples below?
x(y + z). = xy + xz
4(2 + 3) = 8 + 12
Distributive Property
The product of a number x and 8 less the product of another number y and 5
8x - 5y
53 - 15 * 2 + 5
100
(52 -7) * 2 - 45 =
-9
4x2 + 5x + 4y + 6x + - 2x2 + 2y
2x2 + 11x + 6y
A decimal that does not end or repeat is called an __________ number
irrational