Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.

Trending News

Promoted
Austin Riley
Austin Riley asked in Science & MathematicsMathematics · 3 years ago

HELP What makes it one-one??!! Enter Yes or No in each answer space below to indicate whether the corresponding function is one-to-one.?

What makes it one-one?

I'm pretty sure it has to deal with the horizontal and vertical line test but I'm not sure?

Can someone explain this to me please!!??

Thanks

see attached photo.

Attachment image

2 Answers

Relevance
  • ?
    Lv 7
    3 years ago

    If a horizontal line cuts the curve more than once then it is NOT one to one

    1) Yes

    2) Yes

    3) No

    4) Yes

  • az_lender
    Lv 7
    3 years ago

    A one-to-one function does not cross any horizontal line twice.

    (1) sqrt(x) is one-to-one, because you can't have two different numbers with the same square root.

    (2) 7x - 3 is one-to-one; it is a straight, steep line.

    (3) |x - 1| is not one-to-one, because (for example) f(3) = f(-1), and f(1/2) = f(3/2).

    (4) x^3 + 1 is one-to-one; it never turns back on itself.

Still have questions? Get your answers by asking now.