Ответ на фото/////////////
x*y=40
x+y=13
x=13-y
(13-y)*y = 40
13y - y^2 - 40 =0
-y^2 + 13y - 40 = 0
D=169-160=9 = 3^3
y1=8 y2=5
x1=13-8=5 x2=13-5=8
8*5=40
8+5=13
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Ответ на фото/////////////
Verified answer
x*y=40
x+y=13
x=13-y
(13-y)*y = 40
13y - y^2 - 40 =0
-y^2 + 13y - 40 = 0
D=169-160=9 = 3^3
y1=8 y2=5
x1=13-8=5 x2=13-5=8
8*5=40
8+5=13