选择句子补全对话。
A. Nice to meet you.
B. Good morning!
C. I'm Maria.
D. Welcome to China.
E. Are you Jane?
A: Good morning!
B: ____
A: I'm Kangkang. ____
B: No, I'm not. ____
A: ____
B: Nice to meet you, too.
B: Thank you!
若方程(m2﹣9)x2﹣(m﹣3)x﹣y=0是关于x,y的二元一次方程,则m的值为( )