$\"\"$

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Let x is the number of DVDs purchased and y is the price per DVD (dollars).

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From the table, the points are $\"\"$ .

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Substitute the values of $\"\"$ in the slope formula $\"\"$ .

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$\"\"$ . $\"\"$

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To find the y - intercept, substitute the values of $\"\"$ in the slope - intercept from of equation $\"\"$ and solve for b.

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$\"\"$

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$\"\"$

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Add 2 to each side.

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$\"\"$

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$\"\"$ .

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Substitute the values of $\"\"$ in the slope - intercept form of equation $\"\"$ . $\"\"$

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To check the equation, substitute the all values for x in the equation $\"\"$ to obtain random y - values of table.

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If $\"\"$ then $\"\"$ (This is true statement).

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If $\"\"$ then $\"\"$ (This is true statement).

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If $\"\"$ then $\"\"$ (This is true statement).

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If $\"\"$ then $\"\"$ (This is true statement).

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If $\"\"$ then $\"\"$ (This is true statement).

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If $\"\"$ then $\"\"$ (This is true statement).

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The equation $\"\"$ is true for all values of x and y in the table. $\"\"$

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The equation is $\"\"$ .