Exponential model, finding c/y intercept? (1 Viewer)

[davidbarnes]

So I have an exponential model, X agaist logT, etc and have some data values for each of those. I enter these into the calculator in List 1, and List 2 respectively, and then in L3, log list 1, and in L4, log list 2, and graph list 4 against list 1 (log X against t, etc).

That works fine, and from tracing the points i can get the Y2, Y1, X2 and X1 points needed to work out the slope of the line.

However to find the law connecting logX and t, I need to use formula Y=mX+c, and I don't know how to find c (y intercept) from this data or what steps to take on the calculator to do this.

Can anyone give me a hand or idea?

 

[wrxsti]

i think i speak for everyone when i say... WHAT da heck are you on about?

 

[mabel.]

umm...i'm not really sure if this will help seeing as i'm not crash hot at maths but why don't you make the variables equal to zero?