Equations that have the same SOLUTIONS (or same value for the variable)
100
3(2x+5)
6x + 15
100
15 + s =42
s = 27
100
y-8 = 12
y = 20
100
Variable
symbol, usually a letter that represents the value(s) of an unknown number
200
Rational Number
Any number that can be written in the form a/b, where a and b are integers and b does not equal 0. A rational number in decimal form is either a terminating decimal (5.15) or repeating (.416666....)
200
3(2n+1) + 4(n-2)
10n - 5
200
x/-9=8
x= -72
200
19 = r/3
r = 57
200
inequality
is a mathematical sentence that compares the values of two expressions using an inequality symbol such as less than or greater than etc
300
define set and element of a set
SET: well defined collection of objects
ELEMENT OF A SET: Each object that is in a set
300
(x-1)(-9)
-9x+9
300
(5/2)x = 15
x = 6
300
Which equations are equivalent?
a) y- 8 = 12
b) y/2 = 2
c) 2y= 40
d) -22 = y - 42
a, c and d are equivalent b) y = 4 a), c) and d) y =20
300
Perfect Square
the square of an integer. For example 49 is a perfect square because 7^2 =49
400
exponent
tell you how many times to use the BASE as a factor
400
4(p-q)/6(p+q)
4p-4q/6p+6q
400
2x= 3/5
x= 3/10
400
Solve for x AND say how you would check your answer
2x + 3 + x -6 = 15
x= 6... to check your answer plug in 6 for x so 2(6) + 3 +(6) -6 so 12 +3 +6 -6 which equals 15 so x= 6 is correct
400
Constant
A term that has no variable. For example in the equation: 6a-12... 12 is the constant.