What is the linear function equation represented by the graph?

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f(x)=

Can someone explain the elimination method to me for this problem?

An airport in death valley is 60 feet below sea level, and an airplane is flying 2,000 feet above sea level. how many feet must the plane descend in order to land? a. 2060 b. 2000 feet c. 1940 feet d. 1880 feet e.1400 feet will mark as brainliest

If the value of cos330°is√3/2 then find cos 165°.