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Foundations
hard
0:00.0
If
x
+
y
=
10
x + y = 10
x
+
y
=
10
and
x
2
+
y
2
=
58
x^2 + y^2 = 58
x
2
+
y
2
=
58
, find the value of
x
y
xy
x
y
.
A
21
B
42
C
29
D
20
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