If $$\(3 x+8 y=21\)$$ and $$\(8 x+3 y=23\)$$, then $$\(x+y=\)$$
A.
2
B.
4
C.
11
D.
22
Exam No：2020 First Round Grade 7 Year：2020 Question No：27
Answer:
B
Knowledge points:
G7 - Algebra - Simple Systems of Equations (Logic & Substitution)
Solution:
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