Help me with a and b

2) (10pt) Consider the parametric equations ac (t) = 12 + 3t, y(t) = 2 - 1 2 a) Find the slope of the tangent line at the point (18,0) dy _ do sine + rcoso dx an (080 - rsing do dy dy at t- 2t dx olx 2t+ 3 b) Find the values of t where the slope of the tangent line is 3