Susan borrowed $19 from her brother. She paid him back $3 the next day. She will then give him $4/week to pay off the debt. How
2 answers:
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Answer:
Step-by-step explanation:
Let:
This is and exact equation, because:
So, define f(x,y) such that:
The solution will be given by:
Where C1 is an arbitrary constant
Integrate with respect to x in order to find f(x,y):
Where g(y) is an arbitrary function of y.
Differentiate f(x,y) with respect to y in order to find g(y):
Substitute into
Integrate with respect to y:
Substitute g(y) into f(x,y):
The solution is f(x,y)=C1
Solving y using quadratic formula:
We need the exponents law
So if
a=3
b=1/2
then
where x represent every half a year.
So if
a=3
b=1/2
then
where x represent every half a year.