y - 25 = 2(x-10)
y = 2x - 20 + 25
y = 2x + 5. slope = 2
perpendicular lines, slope is opposite and reciprocal
so slope of perpendicular line is -1/2
passing thru (-3, 7)
point slope form: y - y1 = m (x - x1)
equation
y - 7 = -1/2(x + 3)
answer
B. y - 7 = -1/2(x + 3)
