Solve the following initial value problem. y' 1 = -7y1 y2 y 2 = -6y1 - 2y2 y1(0) = 4, y2(0) = + y2y' 3. Enter the functions y1(x) and y2(x) (in that order) into the answer box below, separated with a comma. Do not include 'y1(x) =' or 'y2(x) =' in your answer.