Jake exercised for 30 minutes. He noted the calories burned at three times during the workout. How can jake use this information to find out how many calories were burned after 15 minutes of exercise?

Will mark 50 show all what is the solution to the system of equations? use the substitution method and show your work. -5x+y= -3 -15 x+3y=7 explain what your answer in part (a) tells you about the association of the lines in this system.