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Linear Systems
medium
0:00.0
What is the determinant of the system
x
+
y
=
1
,
x
−
y
=
1
x+y=1, x-y=1
x
+
y
=
1
,
x
−
y
=
1
?
A
−
2
-2
−
2
B
0
0
0
C
1
1
1
D
2
2
2
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