How do you enter a graph of ymx b on a TI-84?

(This will work for all equations that start with Y=)

Press Y=. You will see a list on the side that looks like

\Y1=

\Y2=

and so on. If you want to graph y = 2x +3 for example, type 2x+3 after \Y1=. It should look like \Y1 = 2x+3. Press graph. If you cannot see the line, press ZOOM and choose option 6, ZStandard. If you graph a line that you still cannot see after you press ZStandard, try pressing ZOOM and choosing option 0, (the last one), ZoomFit.

If you get a DIM MISMATCH error or an INVALID DIM error, press Quit. Then press 2nd STAT PLOT (above Y=) and choose option 4, PlotsOff. Press ENTER until you see "Done". Then try again. If you get a SYNTAX error, then you made a mistake typing in your equation. Choose Goto and fix the error and then try again.