单选题If 2p+q=11 and p+2q=13, then p+q= ______.A6B8C9D12E18
单选题
If 2p+q=11 and p+2q=13, then p+q= ______.
A
6
B
8
C
9
D
12
E
18
参考解析
解析：
Add corresponding sides of the two given equations: 2p+ q=11, p+2q=13, 3p+3q = 24. Dividing each member of 3p+3q = 24 by 3 gives p+q = 8.
Add corresponding sides of the two given equations: 2p+ q=11, p+2q=13, 3p+3q = 24. Dividing each member of 3p+3q = 24 by 3 gives p+q = 8.
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