Solve the problem using a system of equations.

In a study, a group of athletes was exercised to exhaustion. Let x represent an athlete’s heart rate 5 sec after stopping exercise and y this rate 10 sec after stopping. It was found that the maximum heart rate H for these athletes satisfied the two equations

H = 0.491x + 0.468y + 11.2

H = -0.981x + 1.872y + 26.4.

If an athlete had maximum heart rate H = 180, determine x and y graphically. Round to the nearest tenth. Interpret the answer.