3x+4y-5=0
y=5-3x/4
x²+y²=2
x²+(5-3x/4)²=2
16x²+(5-3x)²=32
16x²+25-30x+9x²=32
25x²-30x-7=0
(5x+1)(5x-7)=0
x=-1/5 x=7/5
当x=-1/5,y=9/10
当x=7/5,y=1/5
3x+4y-5=0
y=5-3x/4
x²+y²=2
x²+(5-3x/4)²=2
16x²+(5-3x)²=32
16x²+25-30x+9x²=32
25x²-30x-7=0
(5x+1)(5x-7)=0
x=-1/5 x=7/5
当x=-1/5,y=9/10
当x=7/5,y=1/5