Help with Integration Q (1 Viewer)

[dimzi]

The Q is:

Find the area bounded by the line y=2x+1, the y-axis and the lines y=3 and y=4.

This is how I did it (thought it would be best if I did it in paint )

What am I doing wrong? The back of the book says 1.25 :S

 

[shafqat]

you've found the area bound by the line, the x-axis and the lines x = 3 and x = 4.
To solve, make x the subject: x= y/2 - 1/2. Then integrate from 3 to 4.

 

[dimzi]

Damn, now Ive got it.

These x's and y's are confusing me! lol

 

[Trev]

Also, integrating x with respect to x, is not x², its x²/2.

 

[CJBrownie]

Also, integrating x with respect to x, is not x², its x²/2.

He is integrating 2x, not x, so the answer is x^2

 

[Trev]

He is integrating 2x, not x, so the answer is x^2

Well then... lol.
I didn't see that