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    hniang's Avatar
    hniang Posts: 3, Reputation: 1
    New Member

    Jan 24, 2011, 06:00 PM
    Which relation represents a function?
    1) {(-7,5),(-7,1),(-10,3),(-4,3)} 3) {(2,0),(6,2),(6,-2)}
    2) {(-6,5),(-3,2),(1,2),(6,5)} 4) {(0,3),(2,4),(0,6)}
    jcaron2's Avatar
    jcaron2 Posts: 986, Reputation: 204
    Senior Member

    Jan 24, 2011, 08:01 PM
    Remember that in order to be a function, each x value can only have one y value associated with it.

    Let's look at the first two points of #1: (-7,5) and (-7,1). Those two points have the same x value, but different y values. So you know right away that #1 is not a function.

    Now can you spot the one that doesn't have repeated x values in it?

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