00:01
Okay, we wanna integrate this differential equation given this condition.
00:11
So i'm gonna multiply through by e to the minus 2x.
00:15
We get this, and then we can integrate.
00:20
C is an arbitrary constant.
00:23
That whole thing has to be zero.
00:25
So we can solve for y, looks like that.
00:29
Then substitute in y equals two and x equals one and solve for c.
00:41
So y looks like that.
00:45
Part b, we have this differential equation.
00:56
So we can separate this easily into x and y.
01:00
Divide by y squared, multiply by dx over x cubed.
01:05
You get that and then integrate.
01:09
You get an arbitrary constant c.
01:13
And then change the sign and then solve for y by taking reciprocal.
01:27
That's our answer.
01:28
We don't have any arbitrary constant.
01:30
We do, the constant's there, c, but we don't have the initial condition.
01:34
So there's not anything else we can do.
01:48
Now we wanna do this one...