2x - 5y = 10
write in slope form, y = mx + b
5y = 2x - 10
y = 2/5x - 2
slope = 2/5
perpendicular slope = -5/2 (just the negative inverse of the slope)
then,
given coordinates are (3, -4)
y - y1 = m(x -x1)
y - (-4) = -5/2(x - 3)
y + 4 = -5/2x + 15/2
y = -5/2x + 7/2
2y = -5x + 7
