Tom packed 12 identical textbooks and 8 identical notebooks in a box and found its weight as 42 lb. After he put 1 more textbook and 10 more notebooks in the same box, the total mass was 59.5 pounds.

Tom packed 12 identical textbooks and 8 identical notebooks in a box and found its weight as 42 lb. After he put 1 more textbook and 10 more notebooks in the same box, the total mass was 59.5 pounds. Write a system of equations to determine the mass “m” in pounds, of one textbook and one notebook