Originally Posted by
cross1933 Online course, material not impressive. I have purchase two other books and researched online information.
I used both of your suggested methods,came up with X=2.712 & Y=1.388. I see my way of getting to this point was correct but I am still missing something in the process to obtain the correct final result.
Finding an intersect with a TI83 can be a little tricky. First, you need to make sure that the point where the two functions intersect is on the screen. For this problem, you need to set the viewing window to something like this (stretching the y axis makes it easier to see the point of intersection):
Xmin=2
Xmax=22
Xscl=1
Ymin=-5
Ymax=5
Yscl=1
Then you go to the calc menu and choose "5:intersect." The calculator will ask you for the "first curve", and you need to position the cursor to the left of the point of intersection on Y1 and hit enter. Then it will ask you for the "second curve" and you need to position the cursor to the right of the point of intersection on Y2 (the calculator will automatically switch to the other function) and hit enter. The calculator will display "Guess?" and you need to hit enter again. It will display "Intersection" and give the answer of X = 10.873127, Y= -1. Hope that helps!