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Mathematics
Problem
Suppose
p
+
q
=
r
+
s
p+q = r+s
p
+
q
=
r
+
s
,
r
+
s
=
t
+
u
r+s = t+u
r
+
s
=
t
+
u
, and
q
=
u
q = u
q
=
u
. Which of the following equalities must be true? a)
p
=
u
p = u
p
=
u
b)
p
=
q
p = q
p
=
q
c)
p
=
t
p = t
p
=
t
d)
p
=
r
p = r
p
=
r
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