Does anyone know the answers to these two? Pls pls tell me if you do, with an explanation if you can, I really need to pass these two question :)

Which value of m will create a system of parallel lines with no solution? y = mx - 6 8x - 4y = 12

Awater tank holds 18000 gallons. how long will it take for the water level to reach 6000 gallons if the water is used at anaverage rate of 450 gallons per day

Prove the converse of the pythagorean theorem using similar triangles. the converse of the pythagorean theorem states that when the sum of the squares of the lengths of the legs of the triangle equals the squares length of the hypotenuse, the triangle is a right triangle. be sure to create and name the appropriate geometric figures.