I need help and i dont know how to do the work of it

asked Oct 20, 2023 71.4k views

1 vote

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4 votes

Answer:

Explanation:

xy=5, y=-2x-8
Using substitution,

$x(-2x-8)=-5\\-2x^(2)-8x=-5\\2x^(2)+8x-5=0\\x=\frac{-8 \pm \sqrt{8^(2)-4(2)(-5)}}{4}\\x=(-8 \pm √(104))/(4)\\x=-2 \pm √(13/2)$

So, if
x=-2+√(13/2) , y=
-2(-2+√(13/2))-8=4-√(26)

And if
x=-2-√(13/2) ,
y=-2(-2-√(13/2))=√(26)-4

Umutesen answered Oct 25, 2023

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