Graph Label with Conditionals

Questions
1

Not necessary for my activity, but curious if it can be done.
I have a random equation generated in the Note CL, that I might have put in the graph as a label, but is there a way to achieve the same results with the conditionals? For example, so it shows y=3x instead of y=3x+0 or so it shows y=2x-5 instead of y=2x+ -5. Random Linear Equation • Activity Builder by Desmos

2

For this type of display, I’ve created conditionals for m and b. Something like this:

m= wherever your slope is generated
b= wherever your intercept is generated
mText= when m=1 `x`
   when m=-1 `-x`
   otherwise `${m}`
bText= when m>=1 `+${b}`
   when m=<-1 `${b}`
   otherwise ``
exp= `y=${mText}${bText}`
2 Likes
3

Wait, I have something like that in the Note CL
content: when b=0 “The equation of the line y=${m}x.”
when b<0 “The equation of the line is y=${m}x${b}.”
otherwise “The equation of the line is y=${m}x+${b}.”

It’s the graph labels I am trying to get to emulate that. Can the graph calculator expression list accommodate code like that? I can’t see how to change the labels in the graph from what you wrote.

4

There’s a point label sink that you can use in the graphing code, not actually in the graph itself. Just define the point with a variable in the graph. Something like A=(0,0) will work. Then pointLabel(“A”): exp from Daniel’s previous code should work.

5

I have this in my graph CL now.
image

It says “Unexpected type in latex interpolation:string”

6

Is that why this isn’t working? Or?
image

7

That error occurs because the mText and bText outputs need to be formatted as latex. Use the backtick symbols instead of the quotation marks. For example,

mText= when m1=1 `x`

You also want to include this line of code:

pointLabel("A"): exp

In the graph, you need this:
image

8

Works perfectly, thank you both!!

1 Like