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lyanova1
@lyanova1
July 2022
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sedinalana
-x-y-1=0⇒x=-y-1
-20=-2y²-xy
-20=-2y²+y²+y
y²-y-20=0
y1+y2=1 U y1*y2=-20
y1=-4⇒x1=4-1=3
y2=5⇒x2=-5-1=-6
(3;-4);(-6;5)
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Answers & Comments
-20=-2y²-xy
-20=-2y²+y²+y
y²-y-20=0
y1+y2=1 U y1*y2=-20
y1=-4⇒x1=4-1=3
y2=5⇒x2=-5-1=-6
(3;-4);(-6;5)