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Answer:
x+y = 12 (the sum of 2 unknown integers)
x-y = 6 (the difference of the 2 ints)
you just need to solve this for x and y. you can do this using substitution.
x + y = 12
x - y = 6 ---> x = y+6
(y+6) + y = 12
2y = 6
y = 3
x = 9 ---> when we plug in y to x+y = 12 we get x = 9
Explanation:
The two cell layers being referred from the question are a layer of alveolar cells and layer of endothelial cells. Gases must diffuse to these layers to proceed to the plasma. The layer of alveolar cells make up the alveolar wall while the layer endothelial cells consist the capillary wall.
