Question 1075773: For each function f in Exercises 53-60, find f(-2) & f(5).
53. f={(-1,18), (-2,12), (0,4), (5,4), (-3,4)}
55. f={(-3/4,-1), (-2,4), (5,2), (8,10)}
I've never seen these types of problems before, & my professor never went over on how to deal with them.
Found 2 solutions by ikleyn, Edwin McCravy:
Answer by ikleyn(52795)   (Show Source):
You can put this solution on YOUR website! .
For each function f in Exercises 53-60, find f(-2) & f(5).
53. f={(-1,18), (-2,12), (0,4), (5,4), (-3,4)}
Do you see this: (-2,12) ? It exactly means that f(-2) = 12.
Do you see this: (5,4) ? It exactly means that f(5) = 4.
55. f={(-3/4,-1), (-2,4), (5,2), (8,10)}
Do you see this: (-2,4) ? It exactly means that f(-2) = 4.
Do you see this: (5,2) ? It exactly means that f(5) = 2.
Answer by Edwin McCravy(20056)  (Show Source):
You can put this solution on YOUR website!
It's so simple.
To find f(-2) in 53, you just look through
53. f={(-1,18), (-2,12), (0,4), (5,4), (-3,4)}
and find that -2 is the first number in (-2,12),
so f(-2) is 12, because 12 is the number right after -2 in (-2,12)
They say "-2 is the input and 12 is the output"
To find f(5) in 53, you just look through
53. f={(-1,18), (-2,12), (0,4), (5,4), (-3,4)}
and find that 5 is the first number in (5,4),
so f(5) is 4, because 4 is the number right after 5 in (5,4)
They say "5 is the input and 4 is the output"
-------------------------------------
To find f(-2) in 55, you just look through
55. f={(-3/4,-1), (-2,4), (5,2), (8,10)}
and find that -2 is the first number in (-2,4),
so f(-2) is 4, because 4 is the number right after -2 in (-2,4)
They say "-2 is the input and 4 is the output"
To find f(5) in 55, you just look through
55. f={(-3/4,-1), (-2,4), (5,2), (8,10)}
and find that 5 is the first number in (5,2),
so f(5) is 2, because 2 is the number right after 5 in (5,2)
They say "5 is the input and 2 is the output"
What could be easier than that?
Edwin
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