Plz answer and clear my doubt plz

Since, (-2,-1) is a solution of the equation mx-2y = 2 So, m(-2) – 2(-1) = 2 -2m + 2 = 2 -2m = 0 m = 0

Similarly,(1,-2) is a solution of the equation 2x-ny= -2 So, 2(1) – n(-2) = -2 2 + 2n = -2 2n = -4 n = -2

Hence, m+n = 0 + (-2) = -2

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