Question

If x=-1 and y=2is a solutions of kx+3y=7 find the value of k

Answer 1

X = -1 and Y = 2 is the solution then it must satisfy the given equation.

Therefore

K × (-1) + 3 × (2) = 7

-K = 7 - 6

-K = 1

K = -1.

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Answer 2

ATQ
K*-1 + 3*2=7
-1k + 6 = 7
-1k = 7-6
K=-1/1
Therefore
K=-1