Solving a differential equation connecting slope and derivative \frac{y(x)-y(a)}{x-a}=y'(x)

Hugh Walls

Hugh Walls

Answered question

2022-04-21

Solving a differential equation connecting slope and derivative
y(x)y(a)xa=y(x)

Answer & Explanation

narratz5dz

narratz5dz

Beginner2022-04-22Added 13 answers

Step 1
Since you are solving the equation for y:(a,x)R, it is implied that x>a, hence the differential equation is equivalent to
1xa=y(x)y(x)y(a),
and this is implies
ln[y(a)y(x)]=ln(xa)+A,
or ln[y(x)y(a)]=ln(xa)+A.
Step 2
These are respectively equivalent to
y(a)eA(xa)=y(x)
or y(x)=eA(xa)+y(a).
This does assume, though, that limx>{a},,x{a}y(x)=y(a).

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