Clearly, the plane passes through the point (0, 3, 0). The direction cosines of the normal to the plane are < 0, 1, 0 >∴ The equation of the plane is 0 ⋅ (x – 0) + 1 ⋅ (y – 3) + 0 ⋅ (z – 0) = 0⇒ y – 3 = 0 ⇒ y = 3.