Which inequality is graphed in blue

When y’all answer can y’all explain too !

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.

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?