A:x22−y28=1
B:x24−y28=1
C:x28−y22=1
D:x28−y24=1
下列方程中①4x+5=1;②3x-2y=1;③3x+y3=1;④xy+y=14.二元一次方程的个数是( )
I miss ______ very much. ( )