7) What is the solution to the system of equations? 8) What is the solution to the system of equations?

9) Solve by using substitution and state the solution as an ordered pair. Show all of the steps used to determine the solution.

10) Solve by using substitution and state the solution as an ordered pair.

Photos attached

Your vet has placed your pet on a diet. the diet is to contain at least 12 mg of fat and at least 14 mg of protein per serving. these requirements are to be obtained from two food sources. source a contains 2 mg of fat and 2 mg of protein per serving. source b contains 1 mg of fat and 3 mg of protein per serving. if source a sells for $1.28 per serving and source b sells for $1.12 per serving, how many servings of each type should be purchased to satisfy the requirements at minimal cost?