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anonymous
 4 years ago
x^2+y^2=20
y=x^2
A. {(4, 2), (4, 2)
B. {(2, 4), (2, 4)
C.(2, 4)
D.(3, 9)
anonymous
 4 years ago
x^2+y^2=20 y=x^2 A. {(4, 2), (4, 2) B. {(2, 4), (2, 4) C.(2, 4) D.(3, 9)

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anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0i think for this one easiest to check answer and see which ones work

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0i DONT KNOW HOW TO DO IT

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0\( x^2+y^2=20 \) and \( y=x^2 \) \( \implies x^4+x^2=20 \)

perl
 4 years ago
Best ResponseYou've already chosen the best response.0y^2 + y  20 = 0 after substitution , (y+5)(y4) = 0

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0\[ (2+x) (2+x) \left(5+x^2\right) =0 \]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0y + y^2 = 20 y^2 + y + 1/4= 20 +1/4 (y+1/2)^2 = 81/4 y + 1/2 = 9/2 y = 4 knowing that... 4 = x^2 x = +/ 2 so it's {(2,4)(2,4)

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0for example, try (2,4) \[2^2=4\] so second equation is satisfied, but \[2^2+4^2=4+16=20\] so first equation is satisfied as well

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Yes substitution is the best choice here.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0now try \[(2)^2=4\] true and \[(2)^2+4^2=20\] also true

perl
 4 years ago
Best ResponseYou've already chosen the best response.0{ (sqrt 5, 5) ( sqrt 5 , 5 ) ( 2, 4) (2, 4) }

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Analytically it would be messy.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0(3,9) does not work because although \[3^2=9\] is true \[3^2+9^2\neq 20\] so that one is out

perl
 4 years ago
Best ResponseYou've already chosen the best response.0the 5's dont work, scratch that

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0and (4,2) does not work because \[4^2\neq 2\]
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