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若集合\(A=\left \{ {\left ( {x，y} \right )|x+y=0} \right \} \)，\(B=\left \{ {\left ( {x，y} \right )|x-2y+4=0} \right \} \)，\(C=\left \{ {\left ( {x，y} \right )|y=3x+b} \right \} \)，若\(\left ( {A\cap B} \right )\subseteq C\)，则\(b=\)___.
参考答案：\(\frac {16} {3}\)
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