How do I solve. 4x+5y=3 3x-2y=8

Give the equations of two different lines that are perpendicular to the line 3x + 4y = 7.

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.

The radius of a sphere is 3 inches. which represents the volume of the sphere?