Sec 3.1
You can solve an equation by using transformations to isolate the variable
on one side of the equation
Isolated variable ­ Coefficient of positive 1
Inverse operations ­ Operations that undo each other, such as addition and subtraction.
Inverse operations help you to isolate the variable
In ALGEBRA the work must be shown!!!!!!
Show work the same way on your papers and test as is shown in class!!!
Simplify
first
Ex 1) x ­ 5 = ­13
Ex 2) ­8 = n ­ (­4)
Each time you apply a transformation to an equation, you are writing a SOLUTION STEP
Solution steps are written one BELOW the other with the equals signs aligned.
Graphing Calculator
In general, the symbol f(x) replaces y and is read as " f of x"
f(x) is called function notation.
Ex 5) Graph Example 1 and 2 from above.
3
Title: Oct 9­7:25 AM (1 of 3)
Solution steps are written one BELOW the other with the equals signs aligned.
The concept!!!!!!And the work you need to show
Whatever you do to one side of an equation you must do to the other side!
We use inverse operations to solve equations!
What is the inverse of addition? ___________
What is the inverse of subtraction? ___________
Title: Oct 9­8:00 AM (2 of 3)
Write an equation and find the length of the side marked x.
Ex 4). The perimeter is 30 feet.
Ex 5). The perimeter is 44 centimeters
12ft
5ft
21cm
x
x
13cm
Assignment page 135, numbers 1, (15 ­ 39 multiples of 3), 42, 43, 44.
Title: Oct 13­12:27 PM (3 of 3)