Question

若方程组4X+3Y等于5 KX-(K-1)Y等于8的解中,X的值比Y的值的相反数大1求K值

Answer 1

4x+3y=5

kx-(k-1)y=8

x=-y+1

代入4x+3y=5

-4y+4+3y=5

y=-1

x=1+1=2

代入kx-(k-1)y=8

2k-k+1=8

k=7