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First off, what's the slope of "r" anyway, 
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low and behold, since "r" is in slope-intercept form, notice, it has a slope of -1/2.
now, any line perpendicular to "r", will have a negative reciprocal slope to it, that is,
so we're really looking for a line whose slope is 2, and runs through 4,-3,
low and behold, since "r" is in slope-intercept form, notice, it has a slope of -1/2.
now, any line perpendicular to "r", will have a negative reciprocal slope to it, that is,
so we're really looking for a line whose slope is 2, and runs through 4,-3,