# graphing functions

Forums Leaving Cert Maths graphing functions

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• #227 Anonymous

:ill have an answer for you by the weekend

• #12540 Anonymous

ill have an answer for you by the weekend

• #12541 Anonymous

The word function is simply a maths term for the word rule. The
letter f is the maths notation for a function.

Take the function f(x)=2x+3. This function (rule) tells us to double
(2) any number (x) and add 3 to it. So if we have the number 1 the
ru

• #12542 Anonymous

explain the rules of graphing functions in veryveryvery simple terms please

• #12543 Anonymous

There are no real "rules" to the graphing part of functions. There is just a procedure. The rules only really apply to the function.

To graph some given function:

Draw in your planes, which for LC, is just the X-Y plane.

Divide your X & Y lines into spcaes that would be suitable for this function.

Plot points onto this XY plane using values that fit into this equation.

Join your dots together. (The fun part!)

only has an x variable, then it will be parallel to the X plane

only has an y variable, then it will be parallel to the Y plane

has both an x and y variable that are first order, then it is a line

has only x or y variable that are quadratic, then it is a curve

has both x and y variables that are quadratic, then it is a circle

has an equation in the form ax^2 + by^2 + cxy + d = 0, then it is a parabola.

I think that's all you need to know for the LC.