CHAPTER 6. GRAPHING EQUATIONS/FUNCTIONS
5: Intersection
Intersection will allow you to determine where two different functions intersect, between your
identified lower bound and upper bound and it will visually move the cursor to this (x, y) coor-
dinate. In addition to identifying the lower bound and upper bound, you will need to identify
which two functions you want to consider. (Keep in mind that you could have 99 different func-
tions graphed at once and the calculator wouldn’t know which two you wanted to consider.)
Example:
Find the intersection point between y1 = x
3
+ x
2
− 5x + 1 and y2 = −x − 4.
First, go back to the Y= menu ( ), enter in y2 = −x − 4 ( ), and then
graph both functions ( ).
Press to use the Intersection command. Identify the 1st Curve by using the up/down
arrows until the cursor is on the first function and press . Identify the 2nd Curve by using
the up/down arrows until the cursor is on the second function and press .
Now identify your lower bound and upper bound using the left/right arrows. Make sure the
point of intersection that you are looking at falls between your lower bound and upper bound.
Once the intersection point is calculated, the calculator will show both the x and y-coordinates
and visually move the cursor to this point.
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