A line passes through the points (1, 5) and (3, 11). What is the equation of this line?

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Question

A line passes through the points (1, 5) and (3, 11). What is the equation of this line?

Accepted Answer

y = 3x + 2 — Award 1 mark for calculating gradient m = (11-5)/(3-1) = 6/2 = 3, then substituting into y = mx + c using one point: 5 = 3(1) + c gives c = 2. B is incorrect — gradient calculated incorrectly. C is incorrect — y-intercept calculated incorrectly. D is incorrect — c should be 2, not 5.

Answer

y = 6x - 1

Answer

y = 2x + 3

Answer

y = 3x + 5

Answer

y = 3x + 2

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