a)
X = [0, 0, -1.5] + r·([2, 0, - 0.5] - [0, 0, -1.5]) + s·[0, 3, 1]
X = [0, 0, -1.5] + r·[2, 0, 1] + s·[0, 3, 1]
b)
Parameterform: X = A + r * AB + s * AC
Koordinatenform: ax + by + cz = d
N = [2, 0, 1] ⨯ [0, 3, 1] = [-3, -2, 6] = - [3, 2, -6]
E: X * [3, 2, -6] = [0, 0, -1.5] * [3, 2, -6]
E: 3x + 2y - 6z = 9
c)
3*2 + 2*1 - 6z = 9 --> z = - 1/6