16 The general solution of the differential equation 
0
y dx
−yx dy
=
 is
(A) xy = C
(B) x = Cy2
(C) y = Cx
(D) y = Cx2
17 The general solution of a differential equation of the type 
1
1
P
Q
dx
x
dy +
=
 is
(A)
(
)
1
1
P
P
Q1
C
dy
dy
y e
e
dy
∫
∫
=
+
∫
(B)
(
)
1
1
P
P
1 Q
C
dx
dx
y e
e
dx
∫
∫
=
+
∫
(C)
(
)
1
1
P
P
Q1
C
dy
dy
x e
e
dy
∫
∫
=
+
∫
(D)
(
)
1
1
P
P
Q1
C
dx
dx
x e
e
dx
∫
∫
=
+
∫
18