Which set of coordinates describes a function? 1. {(-5, - 1), (-3, -3), (-1, - 5), (-5, -7)}
2. {(6,3), (4, 5), (2,3), (0,5)}
3. {(4, -3), (-4,-6), (4,3), (-4,6)}
4. {(2, 4), (2, - 4), (4,8), (6, 2)}

answer:      

step-by-step explanation:

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 !

not sure but it may be b, as i said i'm not sure.

y=sec x is the correct answer

~batmans wife dun dun