Question

find the value of k if x=2,y=1 is a solution of the equation 2x + 3y=k

Answer 1

Put values of x and y in the equation.
$2(2) + 3(1) = k \\ 7 = k$
That's your answer!
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Answer 2

2x + 3y = k
2X2 + 3X1 = k (substituting the values)
4 + 3 = k
7 = k

Ans. k = 7