Need with problem need answers asap

Complete the solution of the equation. find the value of y when x equals to 6 4x+y=20

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

Using graph paper, determine the line described by the given point and slope. click to show the correct graph below.(0, 0) and 2/3