SOLUTION :
b
Area = ∫ f(x) dx
a
where,
a = 1 , b = 2 ,
f(x) = - x + 4 (since slope is - 1, and y-intercept is 4)
So,
Area
2
= ∫ (- x + 4) dx
1
2
= [- x^2 / 2 + 4x ]
1
= [ (- 2^2 / 2 + 4*2) - (- 1^2 / 2 + 4*1)]
= [ 6 - 7/2 ]
= 5 / 2
= 2.5 (ANSWER)
Check :
Graphically , Area = (3 + 2)/2 * 1 = 2.5 (same as above).
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