$\"\"$

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The domain of function is $\"\"$ .

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Let x is the input and y is the output.

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The word $\"\"$ times $\"\"$ indicates multiplication and the symbol $\"\"$ .

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The word $\"\"$ is $\"\"$ indicates the symbol $\"\"$ .

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The word $\"\"$ The output y is 3 times the input x $\"\"$ indicates the equation $\"\"$ . $\"\"$

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Substitute the values $\"\"$ for x in the function equation $\"\"$ .

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If $\"\"$ then $\"\"$ .

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If $\"\"$ then $\"\"$ .

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If $\"\"$ then $\"\"$ .

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If $\"\"$ then $\"\"$ .

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Therefore range is all output values, $\"\"$ . $\"\"$

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The equation for function $\"\"$ and the range is $\"\"$ .