Post on 23-Dec-2015
Write a function rule
EXAMPLE 1
Tell whether the table represents an exponential function. If so, write a rule for the function.
x
y
–1 0
1
21
319
13
+1+1+1
3 3 3
a.
Write a function rule
EXAMPLE 1
The y-values are multiplied by 3 for each increase of 1 in x, so the table represents an exponential function of the form y = abx with b = 3.
The value of y when x = 0 is , so a = .13
13
The table represents the exponential function y = 3x.13
Write a function ruleEXAMPLE 1
x
y
–1 0 21
+1+1+1
4141
116
14
14
14
b.
14
The y-values are multiplied by for each increase of 1 in x, so the table represents an exponential function of the form y = abx with b = .
14
Write a function rule
EXAMPLE 1
The value of y when x = 0 is 1, so a = 1.
14
The table represents the exponential function y = . x
GUIDED PRACTICE for Example 1
Tell whether the table represents an exponential function. If so, write a rule for the function.
1 5
x
y
–1 0 21
125
15
ANSWER yes; y = ( )x15