3x+4y-5=0y=5-3x/4x²+y²=2x²+(5-3x/4)²=216x²+(5-3x)²=3216x²+25-30x+9x²=3225x²-30x-7=0(5x+1)(5x-7)=0x=-1/5 x=7/5当x=-1/5,y=9/10当x=7/5,y=1/5