What was wrong with answers I put? (Geometry)

What is the solution of the systems of equations? y=2/3x+3 x=-2

Consider a cube that has sides of length l. now consider putting the largest sphere you can inside this cube without any point on the sphere lying outside of the cube. the volume ratio -volume of the sphere/ volume of the cube is 1. 5.2 × 10−1 2. 3.8 × 10−1 3. 1.9 4. 2.5 × 10−1 5. 3.8

The vertices of a triangle are a(7.5), b(4,2), and c19. 2). what is