Question

Which relation does not represent a function?













A)
a vertical line



B)
y =
5
9
x - 3



C)
a horizontal line



D)
{(1, 7), (3,7), (5, 7), (7,7)}

Answer 1

A function is a set of ordered pairs in which each x value has only one y value associated with it
first number in order pair is x-coordinate
~

http://www.regentsprep.org/regents/math/algtrig/atp5/lfunction.htm

in order to relation becomes a functions, x values shouldn't repeat


and for graph we have to do vertical line test if graph of the function hits the vertical line more than one spot than graph is not a function