Download - EXAMPLE 3
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EXAMPLE 3 Graph y = ab + k for 0 < b < 1x – h
Graph y = 3 –2. State the domain and range.
12
x+1
SOLUTION
Begin by sketching the graph
of y = , which passes
through (0, 3) and . Then
translate the graph left 1 unit and down 2 units .Notice that the translated graph passes through (– 1, 1) and
312
x
32
1,
– 1 2
0,
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EXAMPLE 3 Graph y = ab + k for 0 < b < 1x – h
The graph’s asymptote is the line y = –2. The domain is all real numbers, and the range is y > –2.
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EXAMPLE 4 Solve a multi-step problem
• Write an exponential decay model giving the snowmobile’s value y (in dollars) after t years. Estimate the value after 3 years.
• Graph the model.
• Use the graph to estimate when the value of the snowmobile will be $2500.
A new snowmobile costs $4200. The value of the snowmobile decreases by 10% each year.
Snowmobiles
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EXAMPLE 4 Solve a multi-step problem
The initial amount is a = 4200 and the percent decrease is r = 0.10. So, the exponential decay model is:
Write exponential decay model.
Substitute 4200 for a and 0.10 for r.
Simplify.
y = a(1 – r) t
= 4200(1 – 0.10)t
= 4200(0.90)t
When t = 3, the snowmobile’s value is y = 4200(0.90)3 = $3061.80.
SOLUTION
STEP 1
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EXAMPLE 4 Solve a multi-step problem
The graph passes through the points (0, 4200) and (1, 3780).It has the t-axis as an asymptote. Plot a few other points. Then draw a smooth curve through the points.
Using the graph, you can estimate that the value of the snowmobile will be $2500 after about 5 years.
STEP 2
STEP 3
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GUIDED PRACTICE for Examples 3 and 4
Graph the function. State the domain and range.
4. y = +114
x–1
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GUIDED PRACTICE for Examples 3 and 4
Graph the function. State the domain and range.
5. y = 5 –223
x+1
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GUIDED PRACTICE for Examples 3 and 4
Graph the function. State the domain and range.
6. g(x) = –3 +434
x – 5
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GUIDED PRACTICE for Examples 3 and 4
7. WHAT IF? In Example 4, suppose the value of the snowmobile decreases by 20% each year. Write and graph an equation to model this situation. Use the graph to estimate when the value of the snowmobile will be $2500.
SOLUTION y = 4200(0.8)t
After about 2 yr.
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GUIDED PRACTICE for Examples 3 and 4
8. SNOWMOBILE The value of a snowmobile has been decreasing by 7% each year since it was new. After 3 years, the value is $3000. Find the original cost of the snowmobile.
$3729.69SOLUTION