If (1, -2) is a solution of the equation 2x-y = P. find the value of P.
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If, (1,-2) is a solution to the equation, 2x-y = P,
then on putting the values of x and y as 1 and -2 respectively, the remainder must be 0.
Hence, substituting values for x and y,
=>2(1) - (-2)=P
=>2+2=P (as [-] x [-] = +)
Hence, P=4
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