Mathematical Equations
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Transcript of Mathematical Equations
Mathematic Equations
By Natalie Hathaway
By Natalie Hathaway
Calculating Mathematical
Equations
What IS that?
A VARIABLE
IS…
a quantity that during a calculation is assumed to change or be capable of
varying in value
You can choose anything to be your
variable!
WE USUALLY USE X OR Y
Using Variables in Equations…
YOUR VARIABLE, X OR Y, ARE INCLUDED IN THE EQUATION.
WHAT DO X AND Y STAND FOR?
It’s like a MYSTERY!
To find out what a variable equals, you must
isolate it.
For Example:
X + 3 = 7X + 3 – 3 = 7 – 3
X = 4
WHEN X WAS ALONE, WE FOUND
ITS VALUE.
Equations with..
PARENTHESES!
(3 x 4) x (2 + 5)
EXPONENTS!
32 + (5 -2)
MULTIPLICATION!
32 + (5 – 2) x 4
DIVISION!32 + (5 – 2) x 4 / 3
ADDITION!
32 + (5 – 2) x 4 / 3 + 7
SUBTRACTION!32 + (5 – 2) x 4 / 3 + 7 - 2
Or, equations containing ALL of those operations.
x2
TO SOLVE THESE EQUATIONS, WE MUST
KNOW & USE A NEW RULE…
If you remember this….
You can calculate almost ANY math
equation!
PLEASE EXCUSE MY DEAR AUNT SALLY
stands for...
This is also known as the
ORDER OF OPERATIONS
WHICH TELLS US WHAT TO DO FIRST IN AN EQUATION THAT CONTAINS MULTIPLE
OPERATIONS.
Calculators automatically follow
this rule.
While doing a problem, write down PEMDAS for visual reference..
PEMDAS
EXAMPLE PROBLEM..
PEMDAS
(3 + 1) + 32 x 4 / 2 + 7 – 1 = y= 4 + 32 x 4 / 2 + 7 – 1 = y= 4 + 9 x 4 / 2 + 7 – 1 = y= 4 + 36 / 2 + 7 – 1 = y= 4 + 18 + 7 – 1 = y= 29 - 1 = y= y = 28