(a)
To find: The convincing argument that f is a one to one function.
(a)

Answer to Problem 51E
f(x1)=f(x2) and x1=x2 therefore by definition this function is one-to-one function.
Explanation of Solution
Given information: The function is: y=f(x)=mx+b
Calculation:
f(x1)=mx1+b f(x2)=mx2+b
Therefore those two functions will be equal when:
mx1+b=mx2+bmx1=mx2x1=x2
Keep in mind that we may divide by m in the final step because m≠0 .
Therefore the required f(x1)=f(x2) and x1=x2 therefore by definition this function is one-to-one function.
(b)
To find: The for the inverse of f .and explain the slope f−1 related.
(b)

Answer to Problem 51E
f−1(x)=xm−bm
The slopes are inverse.
Explanation of Solution
Given information: The function is: y=f(x)=mx+b
Calculation:
Switch x and y to solve for y :
x=my+bmy=x−by=x−bmy=xm−bm
The inverse function of f is:
f−1(x)=xm−bm
The slope of f−1 is 1m .
(c)
To explain: The graph of the function is inverse.
(c)

Answer to Problem 51E
They are a pair of parallel lines as well.
Explanation of Solution
Given information: The function is: y=f(x)=mx+b
Explain:
Let f and g represent linear functions whose graphs are parallel lines, and thus they have the same slope m≠0 .
Then their respective inverses f−1 and g−1 will have the same slope 1m . In other words, the graphs of their inverses will be a pair of parallel lines as well.
(d)
To explain: The graph of the function is inverse.
(d)

Answer to Problem 51E
They are a pair of perpendicular lines as well.
Explanation of Solution
Given information: The function is: y=f(x)=mx+b
Explain:
From 51(b):
f−1 as 1m ,the slope f−1 as 1m and g−1 as (−1m)−1=−m
Since,
1m(−m)=−1
The graph of f−1 and g−1 are perpendicular as well.
Chapter 0 Solutions
Advanced Placement Calculus Graphical Numerical Algebraic Sixth Edition High School Binding Copyright 2020
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