Which of the following relations is not a function? a. {(7, 8), (8, 9), (9, 10), (7, 6)} b. {(7, 8), (8, 9), (9, 10), (10, 11)} c. {(7, 8), (8, 9), (9, 8), (10, 9)} d. {(7, 8), (8, 8), (9, 8), (10, 8)} pls

A.{(7, 8), (8, 9), (9, 10), (7, 6)}

Step-by-step explanation:

when graphing do the straight line test on the x axis with a pencil or something and if the pencil touches more than one dot than it is not a function.

another way is to just look at the numbers for the x axis and if any of the numbers are the same for example (4,6), (4,9) then it is not a function. an example of a function would be (8,9), (2,6).

problem:

f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

f(5/2) = 10/3

i hope this !