Understanding Functions in Mathematics

The video tutorial explains how to determine if y is a function of x by reviewing the definition of a function, which assigns each input exactly one output. It analyzes various equations, including linear equations, to determine if they represent y as a function of x. The tutorial also covers non-function equations, constant functions, and the vertical line test, providing examples and verification methods to illustrate these concepts.

What is the definition of a function in mathematics?

• A relation where each output has exactly one input

• A relation where each output has multiple inputs

• A relation where each input has exactly one output

• A relation where each input has multiple outputs

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CCSS.8.F.A.1

In the context of functions, what does it mean if an input has multiple outputs?

• It is not a function

• It is a valid function

• It is a quadratic function

• It is a linear function

In the equation x + 4y = 8, what is the first step to determine if y is a function of x?

• Subtract x from both sides

• Multiply both sides by 4

• Add x to both sides

• Divide both sides by 8

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What is the slope-intercept form of the equation x + 4y = 8?

• y = -1/4x + 2

• y = 1/4x + 2

• y = -4x + 8

• y = 4x - 8

Why does the equation y = ±x not represent y as a function of x?

• Because it is not a linear equation

• Because it has only one output for each input

• Because it has two outputs for each input

• Because it has no solutions

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CCSS.8.F.A.1

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For the equation y = ±x, what happens when x equals 2?

• y can be either 2 or -2

• y can be only -2

• y can be any real number

• y can be only 2

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CCSS.8.F.A.1

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What is the output value for any input in the equation y = 5?

• The output varies with the input

• The output is always negative

• The output is always 0

• The output is always 5

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CCSS.8.F.A.1

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In the equation y = 5, what can the input x be?

• Only positive numbers

• Only negative numbers

• Any real number

• Only integers

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CCSS.8.F.A.1

In the equation x = -2, why does it not express y as a function of x?

• Because x can be any real number

• Because y has multiple corresponding x values

• Because y can be any real number

• Because x has multiple corresponding y values

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What does the equation x = -2 imply about the input x?

• x can be any real number

• x can be any negative number

• x can be any positive number

• x must always be -2

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CCSS.6.EE.B.5