ax+ky=2①
ax一ky=4 ②
①+②得:
ax+ky+ax-ky =6
2ax=6
x=3/a
①-②得:
ax+ky-ax+ky=-2
2ky=-2
y=-1/k
因为x值比y的值的相反数大1求k的值
又x=3/ay=-1/k所以,
3/a -1/k =1
1/k=3/a-1
1/k=(3-a)/a
k=a/(3-a)