LESSON 5: Solved algebra examples 1
|Introduction to Elementary Algebra
Help on solving algebra math problems
Simple step by step method
Another equation we aim to solve:
What is the number that ‘x’ stands for?
We want something like
With ‘x’ on the left and a number on the right.
Let’s start by making the 9 disappear. To do this we must subtract
9 from BOTH sides of the equation.
On the left side: 9 – 9 equals zero
On the right side: 4 – 9 equals -5
We now have
Next step: 5/2 must go!
Well, 5/2 is multiplied by ‘x’ so we must divide by the same number
5/2. Or we can multiply by the opposite fraction 2/5. It’s easier.
Let’s do it on BOTH sides.
On the left side: 2/5 times 5/2 is equal to 1. Because the ‘1x’ is the same as
only ‘x’ we got the ‘x’ alone on the left side.
On the right side: -5 times 2/5 is equal to -2
So the final answer is
Which is true if we try to use -2 instead of ‘x’ in the starting equation.
The equation is solved !
In rapid motion...
Bye for now. More answers to algebra problems examples in a few days.