brucemartineau8475
13.04.2020 •
Mathematics
X^2+8x-4=y
Does this represent a circle? Why or why not?
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Ответ:
no, couse equation of circle has form
Ответ:
32
Step-by-step explanation:
Let x + y = 5
x = 5 - y(1)
10x + y -9 = 10y + x . (2)
Substituting (1) in (2)
10(5-y) + y - 9 = 10y + (5-y)
50-10y + y - 9 = 10y + 5 - y
41 - 9y = 9y + 5
-9y - 9y = 5-41
-18y = - 36
y = 36/2 = 2
So, x = 5-2 = 3