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sloppycanada

  • one year ago

Is the following a functions?

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  1. sloppycanada
    • one year ago
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    |dw:1442802872948:dw|

  2. anonymous
    • one year ago
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    yes

  3. sloppycanada
    • one year ago
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    Is this? {(1, 2), (6, -2), (4, 0), (-2, 6)}

  4. anonymous
    • one year ago
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    wanna know secret to figure this kinda stuff out easy?

  5. anonymous
    • one year ago
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    gonna tell you anyway

  6. anonymous
    • one year ago
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    make a graph with the given points, plot them. connect the dots... then draw a single line straight down. this process is known as the vertical line test.

  7. anonymous
    • one year ago
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    if it touches the line more than one then it can not be a function. another way to test to see if the x-value is used twice. then you also know that that cannot be a function.

  8. anonymous
    • one year ago
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    but Q2 is a function

  9. sloppycanada
    • one year ago
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    So if it's a straight line, it's a function?

  10. anonymous
    • one year ago
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    if the straight line doesnt touch the connected lines twice ill draw example

  11. sloppycanada
    • one year ago
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    but both of these are functions, correct? {(1, 2), (6, -2), (4, 0), (-2, 6)} |dw:1442803417818:dw|

  12. anonymous
    • one year ago
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    |dw:1442803291128:dw|

  13. anonymous
    • one year ago
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    yes they both are

  14. anonymous
    • one year ago
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    forgive the bad drawing... but see how that line only touched the connecting line once?

  15. sloppycanada
    • one year ago
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    yes

  16. anonymous
    • one year ago
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    that means it is a function. cuz no matter where it you draw that line, it will only touch once.

  17. anonymous
    • one year ago
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    and again, if you have the same X value twice but different Y values then that too isnt a function. so (4,3) (4,5) is not a function.

  18. anonymous
    • one year ago
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    anymore questions?

  19. sloppycanada
    • one year ago
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    nope thanks

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