Answer :

When a straight line y = 2x + k passes through the point (1, 2), then the value of k can be obtained by substituting x = 1 and y = 2

in the equation of the straight line y = 2x + k.

i.e. 2 = 2×(1) + k

⇒ k + 2 = 2 (commutative property)

⇒ k = 2–2 = 0

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