Help ASAP pls and why

Find the solution of system of equation y= x-4 y=4x+2

The perimeter of a quarter circle is 14.28 miles. what is the quarter circle's radius?

You are a male who just graduated from college with a bachelor's degree. you have a job paying $50,780.00/yr. a. how does your salary compare to the yearly median earnings for a male with a bachelor's degree? b. what is the difference between the yearly median earnings for a male with a bachelor's degree compared to a male who does not attend college after earning a high school diploma?