# Maths again! (the last thing!)

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#1
Hi!
Sorry, bout buggin u guys again! One last thing I need 2 no though! and PLEASE PLEASE PLEASE HELP! How do you draw a y=mx+c line on a scatter graph you have created? I mean, how do you work out mathmatically (but only GCSE level) where the line goes?
THANX!
0
17 years ago
#2
draw a trendline which is straight.

take two points in that line, divide the difference in the y axis by the difference in the x axis to find m. c is the point where it crosses the y axis.
0
17 years ago
#3
Do excel, then linear trendline, and then it gives you the formulae of the line it self.

But doing it by hand is rather rough in itself anyway, so best advice is doing it by excel.
0
17 years ago
#4
Enter the data into your calculator on the regression setting and calculate the a and b to form the equation of your line, normally y=a+bx
Substitute in the x values and use to find the y variables. Plot these points and draw a straight line through them..
0
17 years ago
#5
regression.
0
17 years ago
#6
(Original post by Ralfskini)
regression.
excuse me?
0
17 years ago
#7
(Original post by mik1a)
excuse me?
Regression is a stats technique you can use to draw the best trendline. You algebraically try to minimise the squares of the differences between a hypothetical line and your points.
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