✔ 最佳答案
Sol
1
a(101x+97y+23)+(67x+89y-5)=0
a(101-97+23)+(67-89-5)=0
27a-27=0
a=1
(101x+97y+23)+(67x+89y-5)=0
168x+186y+18=0
28x+31y+3=0
2
a/4+b/5=c
ax+by+c=0
ax+by+a/4+b/5=0
20ax+20by+5a+4b=0
(20ax+5a)+(20by+4b)=0
5a(4x+1)+4b(5y+1)=0
4x+1=0
x=-1/4
5y+1=0
y=-1/5
(-1/4,-1/5)