Question

m+3n=-13;4m-n=21
liner eqution
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Answer 1

m=50/13 & n=(-73)/13

Putting the values of m and n in the equation 1;

m+3n=(-13)

(50/13)+3(-73/13)=(-13)

(50/13)-(219/13)=(-13)

{(50-219)/13}=(-13)

(-169/13)=(-13)

(-13)=(-13)

LHS=RHS

Hope it helps..