13. Find the equation of the curve that satisfies the differential equation yy′ + 2x = 0 and that passes through the point (3,−1).
(A) 5ec0e270b5b88.jpg
(B) 5ec0e2795bce6.jpg
(C)5ec0e282eec90.jpg
(D)5ec0e28c88a23.jpg
(E)5ec0e2a3ae678.jpg

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統計： A(0), B(1), C(0), D(0), E(0) #2308501