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x - y = 5
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document.write( "using the given:
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document.write( "x = 5 + y
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document.write( "square both sides
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document.write( "x^2 = 25 + 10y + y^2
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document.write( "x^2 = 65 + y^2
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document.write( "65 + y^2 = 25 +10y +y^2
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document.write( "65 = 25 + 10y
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document.write( "40 = 10y
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document.write( "4 = y
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document.write( "y = 4
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document.write( "x - y = 5
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document.write( "x - (4) = 5
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document.write( "x = 9
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document.write( "check, does 9^2 - 4^2 = 65?
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document.write( "yes, 81 - 16 = 65
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document.write( "x = 4, y = 9
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