X²+y²=2 ①
4x+3y=5 x=(5-3y)/4②
代②入① (5-3y)²/16+y²=2 25-30y+9y²+16y²=32 25y²-30y-7=0
(5y-7)(5y+1)=0 y=7/5或y=-1/5
当y=7/5时,x=(5-3×7/5)/4=1/5
当y=-1/5时,x=(5+3×1/5)/4=7/5
X²+y²=2 ①
4x+3y=5 x=(5-3y)/4②
代②入① (5-3y)²/16+y²=2 25-30y+9y²+16y²=32 25y²-30y-7=0
(5y-7)(5y+1)=0 y=7/5或y=-1/5
当y=7/5时,x=(5-3×7/5)/4=1/5
当y=-1/5时,x=(5+3×1/5)/4=7/5