Post on 16-Nov-2014
description
Solving Equations
One-Step Equations
Solving One-Step Equations
• Goal Your final answer should be
variable = number x = 7
The Golden Rule of Algebra
• Whatsoever you do to one side of an equation, you must ALWAYS do to the other.(Draw a line through the equal sign to divide the equation
into two sides.)
For example: x + 3 = 5 - 3 - 3 x + 0 = 2 x = 2
Keep it balanced.
Goal
Undoing Operations
• To reach your goal, you must isolate the variable on one side by undoing the operation. To zero out a number (or undo it), you simply do the opposite operation. To undo addition, you subtract. To undo subtraction, you add.
To undo multiplication, you divide. To undo division, you multiply.
Solving One-Step Equations
Problem:
Undo addition with subtraction.
Solving One-Step Equations
Solution
Solving One-Step Equations
• Undo subtraction with addition.
x – 4 = -2 + 4 + 4 x + 0 = 2 x = 2
Don’t forget your integer
rules!
Solving One-Step Equations
• Undo multiplication with division.
3x = 9 3 3 1x = 3 x = 3
The 3’s cancel
Solving One-Step Equations
• Undo division with multiplication.
x = 2 5 5∙x = 2 5 ∙ 5
x = 10
The 5’s cancel
Solving One-Step Equations
Remember, keep it balanced …
Now, have fun solving One-Step Equations!