rating factors by inspection and solve the following:
1.
2
(3)0.xdyyxdx−−=
Ans:
3
y
xc
x
+=
2.
2
2.
xx
yeedyxydx
−−
+=
Ans:
2
x
e
y
xc
−
=+
3.
2
22.xdyydxyxdy+=
Ans:
2
2y
xyce=
4.
2222
()()()()
.
xyxdyydxxyxdxydy+−=−+
Ans:
22
()()()xycxyxy+=−+
Ch02.indd 44Ch02.indd 4412/9/2011 11:37:01 AM12/9/2011 11:37:01 AM
Diff
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