Question

关于x,y的方程组 x+y=3k-4 x-y=k+2

Answer 1

x+y=3k-4

x-y=k+2

解得：x=2k-1,y=k-3

x=2k-1>0 k>1/2

y=k-3>0 k>3

取k=4,

x=2k-1=2*4-1=7

y=k-3=4-3=1