Question

若方程组 4x+3y=1；ax+（a-1）y=3 的解x与y相等，呢么a的值为

Answer 1

因为4x+3y=1,所以3=3(4x+3y),所以ax+（a-1）y=3(4x+3y),又因为ax+（a-1）y=3 的解x与y相等
即(2A-1)X=21X
A=11

Answer 2

y=3 所以4x+3y=4x+9=1，得x=2
所以ax+（a-1）y=2a+3（a-1）=5a-3=3
a=6/5=1.2

Answer 3

X=Y,4X+3Y=1,4X+3X=1,X=Y=1/7

2/7A-1/7=3
A=11