Solving equations
From Wikiversity
Solving equations is the most fundamental concept of algebra. It is the key to learning algebra. Examples of problems you will learn to solve are: 3x=15; 5(3-x)=30
Let us start by solving: 3x=15
1) 3x=15
2) Divide each side by 3
3) x=5
You get this answer, because when solving equations, you always do the opposite of the function to get the variable on one side. You know to divide a three from each side because whenever you see a number next to a letter, it means to multiply. For example. x+3=7 You subtract three from each side, because you want to get rid of the three.
To help you understand this concept, think of a scale. Whatever you do to one side, do the same to the other.
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