Find equations of the tangents to the curve x = 9t² + 6, y = 6t³ + 3 that pass through the point (15, 9) . (Enter your answers as a comma-separated list.)
a) y = 3x - 36, y = -3x + 54
b) y = 3x - 36, y = -3x - 54
c) y = 3x + 36, y = -3x + 54
d) y = 3x + 36, y = -3x - 54