.关于x,y 的二元一次方程ax+b=y 的两个解是,,则这个二元一次

.关于xy 的二元一次方程axby 的两个解是,则这个二元一次方程是……………………………………………………………………………(   )

(A)y=2x+3                       (B)y=2x-3

(C)y=2x+1                       (D)y=-2x+1

【解析】将xy的两对数值代入axby,求得关于ab的方程组,求得ab 再代入已知方程.

 

答案

B.

 

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