What is the solution of this system of linear equations? 3y = x + 6 y – x = 3

The radius of the base of a cylinder is 10 centimeters, and its height is 20 centimeters. a cone is used to fill the cylinder with water. the radius of the cone's base is 5 centimeters, and its height is 10 centimeters.

Scale factor of 2 is used to enlarge a figure as shown below the area of is 18 in.²

How do you use the elimination method for this question? explain, because i really want to understand!