# Classpad 330 Help

### #1

Posted 09 January 2010 - 10:35 AM

I need to know how to transpose an equation to make a specific pro numeral the subject.

how to find the gradient of a line from an equation.

how to find the co-ordinates of the points on the curve knowing only the y value and equation.

how to find the equation of the line joining two points.

Thanks in advance

### #2

Posted 09 January 2010 - 06:23 PM

1. How to transpose an equation to make a specific pro numeral the subject?

Please explain the terms and give an example. I have never heard of a pro numeral or an equation having a subject. Perhaps you are asking a language question as opposed to a math question?

2. How to find the gradient of a line from an equation?

A linear equation can be put into the form y=mx + b in which case m is the slope (gradient) of the line. You can do this on your calculator using solve.

3. How to find the co-ordinates of the points on the curve knowing only the y value and equation?

Solve the equation for x and then substitute in any y value and the x value obtained along with that y value are the co-ordinates of a point on the curve.

4. How to find the equation of the line joining two points?

Arbitrarily number one point to be point one and the other point two. Then from the co-ordinates you will have x1 and x2 values along with y1 and y2 values. The slope m of the line is (y2-y1)/(x2-x1) and you can do this arithmetic using your calculator if you like. The equation of the line then is:

y-y1=m(x-x1).

Thanks in advance

[/quote]

### #3

Posted 09 January 2010 - 09:11 PM

Thank you

### #4 Guest_hiyas7926_*

Posted 13 January 2011 - 07:25 AM

Thanks for the quick reply, I know how to do these equations, but I was having trouble figuring out how to solve them on the ClassPad 330. I should have made myself more clear in my original post, I apologize. Could anyone please explain how to solve the equations using the ClassPad 330?

Thank you

i just got mine aswell and i cant figure out how to do any of that stuff

what i really want 2 no though sounds simple but has been giving me a lot of trouble

do you know how to delete an entire line in the main i can only delete the numbers on the left side

### #5

Posted 18 January 2011 - 12:37 PM

Click that line and select Edit->Delete.how to delete an entire line in the main i can only delete the numbers on the left side

As Astro491K said this question is not clear...How to transpose an equation to make a specific pro numeral the subject?

Example: y+4x=5.how to find the gradient of a line from an equation?

Solve it for y:

**solve(y+4x=5,y)**

You'll get {y=-4*x+5}. "-4" is the slope.

Example: Find the value(s) of x where y=2 in the following equation: y=x^2how to find the co-ordinates of the points on the curve knowing only the y value and equation.

Answer:

**solve(y=x^2)|y=2**

You'll get {x=-sqrt(2),x=sqrt(2)}.

You can define a function to do it:how to find the equation of the line joining two points.

**define eqline(px1,py1,px2,py2)=((py2-py1)/(px2-px1))*(x-px1)+py1**

Example: Find the equation of line joining two points (1,5) and (2,3):

**eqLine(1,5,2,3)**

You'll get -2*(x-1)+5.

This is it. They're really easy to do if you take time and read the manual.

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