I need help. I didn't get a good teacher at school so I didn't understand this: The table shows the outputs y for different inputs x: Input (x) 5 6 7 8 Output (y) 2 5 8 11 Part A: Do the data in this table represent a function? Justify your answer. Part B: Compare the data in the table with the relation f(x) = 2x + 13. Which relation has a greater value when x = 7? Part C: Using the relation in Part B, what is the value of x if f(x) = 75?

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I need help. I didn't get a good teacher at school so I didn't understand this: The table shows the outputs y for different inputs x: Input (x) 5 6 7 8 Output (y) 2 5 8 11 Part A: Do the data in this table represent a function? Justify your answer. Part B: Compare the data in the table with the relation f(x) = 2x + 13. Which relation has a greater value when x = 7? Part C: Using the relation in Part B, what is the value of x if f(x) = 75?

Mathematics
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Isn't it when x its own y?
I mean when x has its own y
hmm.. well the "formal" defintion of a function is that for every value of "x", there is ONLY one value of "y". So basically, each "x" cannot have more than 1 y-value. :) So do you think your data is a function?

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Yes
excellent :D So now moving onto part b. Look at the function given: \[f(x) = 2x + 13 \] What would f (7) = ? [note: to do this, just plug in x = 7 ... basically replace the x with a 7 ]
2(7)+13 So 27?
yyees! :) So for the relation f (x) = 2x + 13 , f (7) = 27 Now looking at your table, what is your "y" when x= 7 ?
8
yes, so now can you answer part b? :)
Yes
I think I can answer C too now
alrightiess :)
see, it wasn't as bad as you thought :)!
I guess it wasn't explained well by my algebra teacher. Thanks!
you're welcome :)!

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