Question

If (1 ,1) is a solution of 10x + 20y = 2k then k = ​

Answer 1

Answer:

If x = 1 and y = 1 , then

$10(1) + 20(1) = 2k \\ 10 + 20 = 2k \\ 30 = 2k \\ transpose \: 2 \: to \: lhs \\ \frac{30}{2} = k \\ 15 = k$

Hence , the value of K = 15.

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