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(a)

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Write the linear equation that relates the amount $\"\"$ spent on advertising to the number $\"\"$ of boxes the company aims to sell.

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Line equation in slope-intercept form is $\"\"$ ,where $\"\"$ is slope and $\"\"$ is $\"\"$ -intercept.

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Advertising expenditure of the company $\"\"$ - $\"\"$ boxes sold.

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Advertising expenditure of the company $\"\"$ - $\"\"$ boxes sold.

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Use the coordinates $\"\"$ to find the slope of the linear equation.

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Formula for slope is $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ .

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Find the $\"\"$ -intercept by substituting $\"\"$ in $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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Then the equation is $\"\"$ .

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The linear equation is $\"\"$ .

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(b)

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Advertising expenditure of the company when sell $\"\"$ boxes.

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ needed to sell $\"\"$ boxes

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(c)

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Slope is $\"\"$ .

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Each additional box requires an additional $\"\"$ in advertising.

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(a) The linear equation is $\"\"$ .

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(b) $\"\"$ needed to sell $\"\"$ boxes.

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(c) Each additional box requires an additional $\"\"$ in advertising.