1. The problem asks to complete the drawings using the line of symmetry marked by the dashes. 2. A line of symmetry means that one side of the shape is a mirror image of the other side across the line. 3. For the left shape (house with triangle roof and rectangular base), reflect each point and line segment on the left side across the vertical dashed line to the right side. 4. For the right shape (polygon with zig-zag bottom and pointed tip), reflect each point and line segment on the right side across the vertical dashed line to the left side. 5. This reflection means that for every point $(x,y)$ on one side, the corresponding point on the other side will be $(2a - x, y)$ where $x=a$ is the vertical line of symmetry. 6. By drawing these reflected points and connecting them in the same order, the shapes will be completed symmetrically. Final answer: Complete the drawings by reflecting all points and lines across the vertical dashed line to form mirror images on the opposite side.