Question

下列方程中，是二元一次方程的是

1. A.
   x+2＝3(x-1)+4
2. B.
   9(x-2)+2(y+2)＝0
3. C.
   x(x-3)+3(y+2)+z＝0
4. D.
   2(x+1)+3(y-1)+z＝0

Answer 1

B