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[tex]xy=-10[/tex] [tex]x+y=11[/tex] Rearrange and substitute [tex]y=11-x[/tex] [tex]x(11-x)=-10[/tex] [tex] -x^{2} +11x+10=0[/tex] [tex](-x+10)(x-1)[/tex] [tex]x=1or,x=-10[/tex] substitute 1 and -10 in for x to find y
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