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Select a graph that have an equation with a < 0

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.

What is the measure of ac? 5 units 13 units 26 units 39 units 3x- 2b 6x + 9