Graph the line passing through the given point and having the given slope-intercept form of the equation of the line if possible. (1,-2),m=-1/2

y = m x + b

y = -x/2 + b

-2 = -1/2 + b

-1.5 = -3/2 = b

y = -x/2 -3/2
or
2 y = -x - 3