Question 21 Let us calculate uie area of the closed region bounded by y - 4y -x and y=x+4. The first equation is a The two graphs intersect at ( point contains the upper limit. opening to the and ( while the second is a ). The first point must contain the lower limit and the second whose slope is differential area element. The expression for the area equals J Evaluating the definite integral, the To easily calculate the area, we will use a evaluated from to area equals square units.

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