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What is the y-intercept of the line with the equation y = 3x + 1?

  1. -3

  2. -1

  3. 1

  4. 3

The correct answer is: -1

The y-intercept of a line is the point where it crosses the y-axis, when the x-coordinate is 0. In this equation, the y-intercept is 1, as shown by the constant term 1. Option A is incorrect because it is the negative value of the y-intercept. Option C is incorrect because it is the value of the slope, not the y-intercept. Option D is incorrect because it also represents the slope, not the y-intercept.