## What is an Equation?

An equation says that 2 things space equal. That will have actually an equals sign "=" favor this:

 x + 2 = 6

That equations says: what is ~ above the left (x + 2) is equal to what is ~ above the ideal (6)

So one equation is favor a statement "this equals that"

(Note: this equation has actually the systems x=4, read just how to deal with equations.

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## What is a Formula?

A formula is a reality or ascendancy that uses mathematical symbols. the will typically have:

an equates to sign (=) two or more variables (x, y, etc) the stand in for worths we don"t recognize yet

It reflects us just how things are pertained to each other.

### Example: The formula for finding the volume of a crate is:

V = lwh

V stands for volume, l because that length, w because that width, and also h for height.

When l=10, w=4, and h=5, then:

V = 10 × 4 × 5 = 200

These room all equations, but only some are formulas:

 x = 2y - 7 Formula (relating x and also y) a2 + b2 = c2 Formula (relating a, b and c) x/2 + 7 = 0 Not a Formula (just one equation)

## Without the Equals

Sometimes a formula is created without the "=":

### Example: The formula because that the volume that a crate is:

lwh

But in a method the "=" is tho there, due to the fact that we have the right to write V = lwh if we want to.

See more: How Much Water Does It Take To Fill A Bathtub ? How Long Does It Take To Fill An Average Bathtub

## Subject that a Formula

The "subject" the a formula is the single variable (usually on the left the the "=") that everything else is equal to.

### Example: in the formula

s = ut + ½ at2

"s" is the subject of the formula

## Changing the topic

A very an effective thing the Algebra have the right to do is to "rearrange" a formula therefore that another variable is the subject.

### Example: Rearrange the volume that a crate formula (V = lwh) so that the width is the subject

divide both sides by h:V/h = lw
divide both political parties by l:V/(hl) = w
swap sides:w = V/(hl)

So if we desire a box through a volume that 12, a size of 2, and a height of 2, we have the right to calculate that width:

w = V/(hl)
= 12 / (2 × 2)
= 12 / 4
= 3
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