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
y
1 =
x
3
+
x
2
−
5
x
+ 1
and
y
2 =
−
x
−
4
.
First, go back to the
Y=
menu (
), enter in
y
2 =
−
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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