**(a)**

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

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

Advertising expenditure of the company - boxes sold.

Advertising expenditure of the company - boxes sold.

Use the coordinates to find the slope of the linear equation.

Formula for slope is .

.

Find the -intercept by substituting in .

.

Then the equation is .

The linear equation is .

**(b)**

Advertising expenditure of the company when sell boxes.

Substitute in .

needed to sell boxes

**(c)**

Slope is .

Each additional box requires an additional in advertising.

**(a)** The linear equation is .

**(b)** needed to sell boxes.

**(c)** Each additional box requires an additional in advertising.

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