Question

Which of the following relations is a function?
{ (2, 6), (3, 9), (4, 2), (3, 6) }
{ (2, 8), (3, 6), (2, 4), (0, 2) }
{ (3, -2), (4, 7), (-2, 5), (-4, 5) }
{ (4, 7), (-2, 5), (1, 3), (-2, 1) }

Answer 1

(x,y) order pair where first number represent domain (x-coordinate )
and 2nd number represent range (y-coordinate )
if the x value is repeated then relation is NOT a function

Answer 2

in order to relation a function each `x `value should be attach to exactl one y value

Answer 3

for example t^^
there is not any identical x value; therefore, it is a function