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X +y =12 and xy = 27 then find the value of x - y |
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Answer» ONG>Step-by-step explanation: X=12-y xy=27=(12-y)y=27 =12y-y^2=27 =y^2-12y+27=0 =y^2-3y-9y+27=0 =y(y-3) - 9(y-3) =0 =(y-3) (y-9) =0 =y=3,9 Substitute y in 1st equation, X+3=12 =>x=12-3 =9 And in 2ND equation, 3x=27 =>x=27/3=9 There fore x=9 Then the VALUE of x-y, 9-3=6 and also 9-9=0 |
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