Substitute
, so that

Then the resulting ODE in
is separable, with

On the left, we can split into partial fractions:

Integrating both sides gives




Now solve for
:


Replace the words with what you know
(Original cost)(6%)=5.25
(Original cost)(0.06)=5.25
(original cost)=5.25/0.06=87.5
Answer:
(-1,9)
Step-by-step explanation:
coortinate point is (-9,-1)
use formula
(x,y)=(y,-x)
(-9,-1)=(-1,9)
-5(r-1)
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