Write the equation of the line that has the following

Contains point (3,6) and is perpendicular to y = 2x + 4

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I got that the slope was -1/2 but is the y-intercept really 15/2? can you even have this as a y intercept?

y-6 = -1/2 (x-3)

Clearly (0,15/2) fits the equation

15/2 is just a number, like any other. What bothers you about it?