
Concept explainers
(a)
To find: The equations for y1 and y2 , and domain of each function.
(a)

Answer to Problem 50E
The required equations are:
⇒y1=90°−x⇒y2=180°−x
The required domains are:
Domain of y1 is (0,90) with 0 & 90 excluded.
Domain of y2 is (0,180) with 0 & 180 excluded.
Explanation of Solution
Given information: The ∠3 is the supplement of ∠1 , and ∠2 is the complement of ∠1 . The following data is been given.
⇒∠1=x°⇒∠2=y1°⇒∠3=y2°
Calculation: Since ∠1=x° & ∠2=y1° and ∠2 is the complement of ∠1 .
∴∠1+ ∠2=90°x+y1=90°y1=90°−x
Domain of y1 is (0,90) with 0 & 90 excluded.
Similarly, ∠3=y2° and ∠3 is the supplement of ∠1 ,
∴∠1+ ∠3=180°x+y2=180°y2=180°−x
Domain of y2 is (0,180) with 0 & 180 excluded.
(b)
To graph: The each function.
(b)

Answer to Problem 50E
The range of y1 and y2 are (0,90) and (0,180) , respectively.
Explanation of Solution
Given information: The ∠3 is the supplement of ∠1 , and ∠2 is the complement of ∠1 . The following data is been given.
⇒∠1=x°⇒∠2=y1°⇒∠3=y2°
Calculation: Since ∠1=x° & ∠2=y1° and ∠2 is the complement of ∠1 .
∴∠1+ ∠2=90°x+y1=90°y1=90°−x
Domain of y1 is (0,90) with 0 & 90 excluded.
Similarly, ∠3=y2° and ∠3 is the supplement of ∠1 ,
∴∠1+ ∠3=180°x+y2=180°y2=180°−x
Domain of y2 is (0,180) with 0 & 180 excluded.
The graph of y1 and y2 are plotted below.
Chapter 8 Solutions
BIG IDEAS MATH Integrated Math 1: Student Edition 2016
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