What is the slope of the line represented by the equation y = -1/2 x + 1/4

In which area will soil formation be greatest? a a steep slope in a warm,b wet climate a flat area in a warm,c wet climate a north-facing area on a steep slope a flat area in a cold, d wet climate description

The graph below plots the temperature and luminosity of stars on the main sequence.

Soil color only reflects the amount of organic matter present in soil.