Horizontal Line Test (Leaving Cert Mathematics): Quizzes

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Horizontal Line Test
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What does the horizontal line test determine?

Whether a function is injective

When is a function NOT injective according to the horizontal line test?

If a horizontal line intersects it more than once

What is another term for an injective function?

One-to-one

Is the function y=x2y=x^2 injective?

No, it is not injective

Is the function y=x3y=x^3 injective?

Yes, it is injective

What is true about bijective functions?

They are also injective

Do bijective functions pass the horizontal line test?

Yes, they pass it

If every horizontal line intersects a graph at most once, what can we conclude?

The function is injective

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