V-Shaped Graphs
V-Shaped Graphs
D graph paper .....
.g...r..a...p....h...i.n. g calculator (optional)
ll.IMHfiJH~i Find equations of the form
y = Alx - HI + V for these four graphs.
a .
5
As you know, the radical sign means the nonnegative square root of.
1. Make a table of values, and a graph, for
the function y = fX2 Use at least six val-
ues for x, including positive numbers, negative numbers, and zero.
2. Find a linear function that has the same
graph as y = fX2 when
a. x is positive; b. xis negative.
3. .,_ True or False? .fX"2= x. Explain.
As you may remember, the absolute value of a number is the distance between that number and zero.
4. Repeat problems 1-3 for the function y = lxl.
Graph the functions in problems 5 through l 0. Use separate axes for each one. Write each equation on its graph.
5. y=lxl+2
6. y=lxl-2
7. y = -lxl
8. y = 21xl
9. y = lx + 21
10. y = lx- 21
-5
5
-5
b.
5
-5
5
-5
c.
5
-5
5
-5
d.
5
-5
5
J2.B
Graphs
-5 451
12):i?,I.Jil Write an illustrated report describing graphs of the form y = Alx - HI + V.
Describe how each of the parameters A, H, and V affects the graph. What are the slopes? Where is the vertex? What are the domain and range? Give examples, including both negative and positive values of all
tbe parameters.
13. ..,. Describe the plane's trip.
14. The equation of the graph is of the form
y = Alx - HI + V. What are A, H, and V?
15..... If the plane were going at 300 miles per hour, a. how would the graph be different? b. how would the equation be different?
This graph shows a plane's trip. It was sighted passing over Alaberg at time t = 0.
'?800
?.a2 100
~
o~~~~--L-~-L~~
0.0 05 1.0 1.5 2.0 25 3.0 35 4.0
time (hours)
f;/#jljJI LIKE TERMS
When combining terms involving fractions, it
is sometimes useful to write the fractions with
common denominators. However, it is often
Imore convenient to use the method that is
demonstrated in the following example.
Example:
-x -l- lx 60 70
I
II
= 60 X- 70 X
I
= -0.14x
(A calculator was used for the last step.)
Combine like terms. 16. 32x - 4x
18. 3x + 2
X
2
17?
5x
6
+
7
8 +
9x
4
Chapter 12 Mathematical Modeling
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