What value of c in the equation cx+4y=12 would give the equation a slope of 8? please help me

Asif spent $745.10 on 13 new file cabinets for his office. small file cabinets cost $43.50 and large file cabinets cost $65.95. write and solve a system of equations to find the number of small cabinets and large cabinets he purchased. determine if each statement is true or false. 1. he purchased 5 small cabinets. true or false 2. he purchased 7 large cabinets. true or false 3. he spent $527.60 on large cabinets. true or false

Solve for x and select the correct answer

Find the volume of the solid bounded by the plane z=0 and the paraboloid z=1-x^2 –y^2