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SOLUTION :
b
Area = ∫ f(x) dx
a
where,
a = 1 , b = 3 ,
f(x) = - x + 5 (since slope is - 1, and y-intercept is 5)
So,
Area
3
= ∫ (- x + 5) dx
1
3
= [- x^2 / 2 + 5x ]
1
= [ (- 3^2 / 2 + 5*3) - (- 1^2 / 2 + 5*1)]
= [ 21/2 - 9/2 ]
= 12 / 2
= 6 (ANSWER)
Check :
Graphically , Area = (4 + 2)/2 * 2 = 6 (same as above).
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