Question

Vertical line test question for math, Help!?!?(:
Use the vertical-line test to determine which graph represents a function.

Answer 1

a function can only have 1 y values for every x. so if you can draw a vertical line on the graph of you function and intersect the graph twice there are 2 y values for the x that the line is on. Therefore the graph is not a function.
Go though every graph and ask yourself is there any place that you can place a vertical line and hit the graph on 2 points? If so then the graph is not a function. If not so then the graph is a function.

Answer 2

@freewilly922 Is it the cirlce then?!

Answer 3

circle

Answer 4

can't you draw a vertical line through the circle and hit 2 points?

Answer 5

Ohhhhh So its the first one?!?!

Answer 6

The first one is a vertical line. If you place another vertical line right on top of it, how many overlapping points are there?

Answer 7

1 set of overlapping points?!

Answer 8

Wait no its the last one

Answer 9

Because theres isnt any overlapping points right?!?!

Answer 10

it would be the same as asking how many points in a line= infinite. So a vertical line is not a function. Remember, a vertical line says that at that x value, every y value imaginable is an answer. Not just one. Therefore it can not be a function since there can only be 1 y value for every x value

Answer 11

Yes the last one is the function, since no matter where you draw a vertical line, you will can only intersect the graph part once and only once.

Answer 12

Ok sorry wow i really over looked this problem

Answer 13

@freewilly922 thank you

Answer 14

The definition of a function is important. So no problems. Make sure you understand what the vert. line test is. You need it later at higher levels of math.