Which of the following expressions represents a function?

{(1, 2), (4, –2), (8, 3), (9, –3)}
y2 = 16 − x2
2x2 + y2 = 5
x = 7

Question

Which of the following expressions represents a function?

 {(1, 2), (4, –2), (8, 3), (9, –3)}
 y2 = 16 − x2
 2x2 + y2 = 5
 x = 7

jdoe0001 · Answer

the 1st one has 4 points, and their coordinates, plot those then for the last 3 pick a few random "x" to get a "y", and plot them as well then run the "vertical line test" on the graphs of each see which one passes http://i1.ytimg.com/vi/-xvD-n4FOJQ/hqdefault.jpg <-- vertical line test

anonymous · Answer

so it would be a @jdoe0001

jdoe0001 · Answer

if that's what your graphs show, then sure

anonymous · Answer

@jdoe0001 a is correct?