David's Algebra Helper
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The stuff you came to look for is below, so keep looking. |
| Solving linear equations blah, blah, blah... | How to do them. |
| Problem Solved | Comments |
|
5x+11=7x-9 |
You start out with your basic liner equation. |
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11=7x-9 -5x |
First you want to get your x on one side of the equation only. |
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11=2x-9 |
Now you are ready for your second step. |
|
11=2x-9 +9 +9 |
Next you must get the number on the opposite side of the equation from the variable,you do this by adding the number to both sides. |
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20=2x |
This brings you to your final step, dividing. |
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20/2x |
This will get you the value of x. |
|
10=x |
Or x=10. |
| Solving Literal Equations different but the same... | How to do them. |
| E=F/A, find f |
Let's start with an easy one. |
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EA=F |
To solve this equation all you have to do is reverse the operations. If E=F/A, then EA=F. |
| Now for a harder one! | |
|
K=mgh, find h |
Because you are looking for h, you know that h is being multiplied by m and g to get K. So all you have to do is divide K by m and g. |
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K/mg=h |
See? Simple. |
| Now we are going to write equations. | Whooopeee. |
| slope intercept form | y=mx+b |
| This is slope intercept
form and it is perfect for the equation of a line.
|
This form is simple. M is the slope of the line. B is the y intercept of the line. Plug a point into the equation and it will graph the line. |
| The form that is like x+y=3 is also simple. This is called standard form. | Just rearange it to y=mx+b
form and it is simple.
This equation would be y=1x+3. Since there is no given slope, it is interpreted as 1. |
| The final form is the f of x {f(x)} form. | This can be the hardest
form because it is harder to plug the points into. The equation is written
like this:
f(x)=mx+b. Whatever the x in () is, all x variables are this value. Then just treat it like regular y=mx+b form. |