-9x²+8y²=-241-9x²-8y²=-641отнимем16y²=400y²=400:16y²=25y1=-5
9x²=441x²=441/9=49x=-7 U x=7y2=5x=-7 U x=7(-7;-5);(-7;5);(7;-5);(7;5)
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-9x²+8y²=-241
-9x²-8y²=-641
отнимем
16y²=400
y²=400:16
y²=25
y1=-5
9x²=441
x²=441/9=49
x=-7 U x=7
y2=5
x=-7 U x=7
(-7;-5);(-7;5);(7;-5);(7;5)