A wheelchair ramp must rise 2 feet for every 12 feet horizontally to meet a building entrance. Starting from ground-level point (0,0), write the slope and find the coordinates of the point at the top of a 36-foot section of ramp, then state the slope-intercept equation of the ramp line.

• A. Slope: $\frac{1}{6}$; top point: (36, 6); equation: $y=\frac{1}{6}x$.
• B. Slope: 6; top point: (36, 12); equation: y = 6x.
• C. Slope: $\frac{1}{2}$; top point: (36, 18); equation: $y=\frac{1}{2}x$.
• D. Slope: $\frac{1}{6}$; top point: (18, 3); equation: $y=\frac{1}{6}x$.