In the equation y = mx + b for a line, which statement correctly describes m and b?

Find the slope of the line passing through the points (2, -1) and (5, 4).

Convert the point-slope equation $y-5=-2(x-1)$ to slope-intercept form $y=mx+b$.

If a line has slope -3/7, find the equation in slope-intercept form of the line perpendicular to it that passes through the point (7, -1).

A researcher measures a temperature that drops linearly from 90°C at time t = 0 minutes to 70°C at t = 5 minutes. Express temperature T as a function of t using slope-intercept form T = mt + b.