请选择ABCD)M,W-k-D下面四个等式中表示x和y成正比例关系的是()。-y9Z4V)H0w6{.B+K,K*i
A.xy=6-y9Z4V)H0w6{.B+K,K*i
B. =y-y9Z4V)H0w6{.B+K,K*i
C.6x=y-y9Z4V)H0w6{.B+K,K*i
D.6x=-y9Z4V)H0w6{.B+K,K*i