Find the value of k if (1,-2) is a solution of 2x - ky + 3 = 0
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Step-by-step explanation:
if (1,-2) are solution of 2x - ky + 3 = 0, then by putting
x = 1 and y = -2 in the given equation, LHS = RHS ie 0
therefore 2*1 - k(-2) + 3 = 0
=> 2 + 2k + 3 = 0
=> 2k = -3 - 2
=> 2k = - 5
=> k = - 5/2
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