The equation of a line is y = 3. Write an equation in slope-intercept form of a line parallel to y = 3 that passes through (0, 6).

The line y = 3 is horizontal, so its slope is 0. A parallel line is also horizontal and has the form y = c. Passing through (0, 6) means its y-coordinate is 6, so the equation is y = 6, choice D.

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