Question

check whether 2,0 is a solution of the equation x+2y=4 or not
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Answer 1

Answer:

no, it is giving 2=4 which is wrong

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Answer 2

Answer:

Put x=2 and y = 0

$x + 2y = 4 \\ 2 + 2 \times 0 = 4 \\ 2 + 0 = 4 \\ 2 = 4$

but 2 is not equal to 4 hence these are not a solution of given equation