15 For tax purposes, you may have to report the value of your assets, such as cars or refrigerators. The value you report drops with time.

Straight-line depreciation'' assumes that the value is a linear function of time. If a 1200 dollar refrigerator depreciates completely in 6 years, find a formula for its value as a function of time,x, in years.

value =dollars

7 The linear functionf with valuesf(6)= andf(5)=5 isf(x)=

8Find the equation of the line that passes through the(x,y)points(3,3) and(5,7)

10Determine the slope and they-intercept of the line14x=7y+8

Slope=

y Intercept =

13 Find the equations of the lines that pass through the point(5,7)and are parallel to and perpendicular to the line with equationy+6x=1

Parallel y =

Perpendicular y =

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