Question Details

The area of the region bounded by the curve x = 2y + 3 and the lines y = 1 and y = -1 is

Options

A

4 sq. units

B

3/2 sq. units

C

6 sq. units

D

8 sq. units

Correct Answer :

6 sq. units

Solution :

The correct option is 6 sq. units.

Step-by-step Explanation:

We need to find the area of the region bounded by the curve:
x = 2 y + 3
and the horizontal lines:
y = 1
and
y = 1

Since the curve is expressed as x in terms of y, and the boundary lines are given as horizontal lines y=c and y=d, we can find the area A by integrating with respect to y from y=1 to y=1. Let us first verify if x0 in this interval:
For y=1, x=2(1)+3=1>0.
For y=1, x=2(1)+3=5>0.
Since x is positive throughout the interval [1,1], the bounded area is given by the definite integral:
A = 1 1 x d y

Substitute the equation of the curve into the integral:
A = 1 1 ( 2 y + 3 ) d y

Find the antiderivative:
( 2 y + 3 ) d y = y 2 + 3 y

Now, evaluate the definite integral by applying the limits from 1 to 1:
A = [ y 2 + 3 y ] 1 1

Substitute the upper limit (y=1):
( 1 2 + 3 ( 1 ) ) = 1 + 3 = 4

Substitute the lower limit (y=1):
( ( 1 ) 2 + 3 ( 1 ) ) = 1 3 = 2

Subtract the lower limit value from the upper limit value:
A = 4 ( 2 ) = 4 + 2 = 6

Thus, the area of the bounded region is 6 sq. units.

Unlock Our Free Library

Access expert-curated educational resources and study materials—completely free.

Discover more resources

You may also like

Mock Tests

View All
  • JEE
  • intermediate
  • 3 hours
  • chemistry, mathematics, physics

  • JEE
  • intermediate
  • 3 hours
  • chemical engineering, mathematics, physics