Symbols and Signs
Name these symbols in order!
< > < >
less than, greater than, less than or equal to, greater than or equal to
What is this called? =
Equal Sign
What type of dot would you draw if your inequality had a > ?
An OPEN dot
How many numbers exist?
The world may never know!
(Infinite amount!)
There are two names for this symbol, what are they?
-
Minus and Negative
What would you call x? What is the definition of that vocab word? (what does it mean?)
x is a Variable - a letter that can stand for any number
What does the line mean in the symbol < ?
It means "or equal to," as in "less than or equal to"
How many numbers can go on a number line?
Infinity!!!
What is it called when you reverse a sign to cancel out a number? Using ?
Inverse Operations
Solve for x,
x - 2 = 0
x = 2
What number can you start a number line with?
ANY NUMBER! As long as its Positive to the RIGHT and negative to the LEFT
- <--------0--------> +
If a number is greater than 0, will it go left or right on the number line? Will it go up or down on a number line?
Right, Up
When multiplying or dividing, do you get when you combine ++, - -? What do you get when you combine -+, +-?
+ +, - - = +
+ -, - + = -
Solve for y,
3y = 9
y = 3
Solve this inequality,
x - 18 < -3
x < 15
How can you graph an Equation on a number line?
Open or Closed dot? Would you draw a line?
It would be a closed dot on whatever the answer is, and you dont draw a line. It is equal to ONLY that number.
x = 7 - <-----7-----> +
None! Zero is neither positive or negative.
Solve for a, if b = 4
2a = b
a = 2
Graph this inequality,
y > 13
Open or closed dot? and what direction would the line go, right or left?
- <---------13--------> +
O ------>
What is the difference between an Equation and an Inequality?
Equation means it is EQUAL, inequality means NOT EQUAL (aka greater than or less than)