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Mathematics
Problem
A
,
B
,
C
A, B, C
A
,
B
,
C
and
D
D
D
are the points of intersection with the coordinate axes of the lines
a
x
+
b
y
=
a
b
ax + by = ab
a
x
+
b
y
=
ab
and
b
x
+
a
y
=
a
b
bx + ay = ab
b
x
+
a
y
=
ab
, then a.
A
,
B
,
C
,
D
A, B, C, D
A
,
B
,
C
,
D
are concyclic b.
A
,
B
,
C
,
D
A, B, C, D
A
,
B
,
C
,
D
form a parallelogram c.
A
,
B
,
C
,
D
A, B, C, D
A
,
B
,
C
,
D
form a rhombus d. None of the above
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