Help pls if anyone could help me out it would be greatly appreciated

Write the system of equations represented by the matrix. 0 1 2 4 -2 3 6 9 1 0 1 3

Four individuals pool money together to start a new business and agree to split the profits equally. n invests $6,000, x invests $2,000, y invests $8,000 and z invests $4,000. if the profits for the first month were $100,000, y receives than if the profits were divided in proportion to how much they invested.

If y varies directly as x2 and y=6 when x=6, find the constant of variation.