Answer:
option 1:
7x + 3y = 28
Explanation:
the standard form of the equation is,
ax + by = c
the total protein is equal to 28 grams,
peanuts have 7 grams of protein per ounce, and
granola has 3 grams of protein per ounce
thus, the equation will be written as,
7x + 3y = 28