Given:
25 acres for oranges and pears
7,500 earnings from her crops
2,050 per acre of oranges
2,000 per acre of pears
o = oranges ; p = pears
o + p = 25
2,050o + 2,000p = 7,500
The constraints in her system of equation would be:
o + p = 25
because 25 acres is the maximum measure of land that Farmer Julie can plant on.