8.下列给出的方程中,是二元一次方程的是( )
0 309794 309802 309808 309812 309818 309820 309824 309830 309832 309838 309844 309848 309850 309854 309860 309862 309868 309872 309874 309878 309880 309884 309886 309888 309889 309890 309892 309893 309894 309896 309898 309902 309904 309908 309910 309914 309920 309922 309928 309932 309934 309938 309944 309950 309952 309958 309962 309964 309970 309974 309980 309988 366461
| A. | xy=5 | B. | 6x=5y | C. | x+$\frac{1}{y}$=6 | D. | 4x+y2=6 |