下列各式,属于二元一次方程的个数有( )
①xy+2x-y=7; ②4x+1=x-y; ③+y=5; ④x=y; ⑤x2-y2=2
⑥6x-2y ⑦x+y+z=1 ⑧y(y-1)=2y2-y2+x
A.1 | B.2 | C.3 | D.4 |
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下列各式,属于二元一次方程的个数有( )
①xy+2x-y=7; ②4x+1=x-y; ③+y=5; ④x=y; ⑤x2-y2=2
⑥6x-2y ⑦x+y+z=1 ⑧y(y-1)=2y2-y2+x
A.1 | B.2 | C.3 | D.4 |