Question

how is photosynthesis related to cellular respiration?

Answer 1

they both have opposite equations if you look at them closer. What one produces the other needs. 

Answer 2

Hi there.

Photosynthesis takes energy from the sun & carbon dioxide to make food & oxygen.

Cellular respiration uses the food & oxygen (the result of photosynthesis) to make carbon dioxide.

Photosynthesis uses the carbon dioxide from cellular respiration, which uses the food & oxygen from photosynthesis.

Hope this helped you!