Question

已知方程组ax+3y=9,2x-by=6 (1)当a,b为何值时,此方程组无解; (2)当a,b为何值时,此方程组有唯一

Answer 1

ax+3y=9,

2x-by=6

⑴a/2=3/(-b)≠9/6,

求不出a、b.

⑵a/2≠3/(-b),

⑶a/2=3/(-b)=9/6,

a=3,b=-2.