You want the equations with variables x1 being the cupfuls of food 1, x2 being cupfuls of food 2 and x3 being cupfuls of food 3.
each equation corresponds to one of the components (fat, carb, protein).
Then solve for the cupfuls.
A diet calls for 2 units of fat, 3 units of protein, and 5 units of carbohydrate for a meal.
Suppose food 1 has in each cupful: 10 units of fat, 1 unit of protein, and 2 units of carbohydrates.
Suppose food 2 has in each cupful: 1 unit of fat, 5 units of protein, and 4 units of carbohydrates.
Suppose food 3 has in each cupful: 1 units of fat, 2 units of protein, and 6 units of carbohydrates.
Write down a linear system in three variables, whose solution will tell us how to make up a meal out of foods 1, 2 and 3. Say what the three variables represent.
*give ur workings and a clear answer.