document.write( "Question 30544: (#7) Question:
\n" ); document.write( "Solve the system:
\n" ); document.write( "x^2+y^2=20
\n" ); document.write( "x^2-2y^2=8\r
\n" ); document.write( "\n" ); document.write( "Answers:
\n" ); document.write( "(A) (04,2) (-4,-2)
\n" ); document.write( "(B) (1, sqrt19) (-1, -sqrt19)
\n" ); document.write( " (-1 sqrt 19) (-1. -sqrt 19)
\n" ); document.write( "(C) (4,2) (4, -2)
\n" ); document.write( "(D) (4,2) (4, -2)
\n" ); document.write( " (-4,2) (-4, -2)\r
\n" ); document.write( "\n" ); document.write( "Please be specefic as to which letter answer is correct. \n" ); document.write( "
Algebra.Com's Answer #17209 by sdmmadam@yahoo.com(530)\"\" \"About 
You can put this solution on YOUR website!
Solve the system:
\n" ); document.write( "x^2+y^2=20 ----(1)
\n" ); document.write( "x^2-2y^2=8 ----(2)
\n" ); document.write( "(1) - (2)
\n" ); document.write( "(x^2-x^2)+[y^2- (-2y^2)] = 20-8
\n" ); document.write( "0 +(y^2+2y^2) = 12
\n" ); document.write( "3y^2 = 12
\n" ); document.write( "y^2 = 12/3= 4
\n" ); document.write( "y = +2 or -2
\n" ); document.write( "Putting y^2 = 4 in (1)
\n" ); document.write( "x^2+4 = 20
\n" ); document.write( "x^2 = 20-4
\n" ); document.write( "x^2 = 16
\n" ); document.write( "x= +4 or -4
\n" ); document.write( "Answer: (4,2),(4,-2), (-4,2) and (-4,-2)
\n" ); document.write( "which is your choice
\n" ); document.write( "(D) (4,2) (4, -2)
\n" ); document.write( " (-4,2) (-4, -2)\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
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