PLEASE HELP IM IN GEOMETRY THIS QUESTION IS VERY CONFUSING

For how answer my question this will be the last question can you answer in math subject

Sheila wants to bake six muffins but the recipe is for 12 muffins . this means you only need half of the ingredients listed how much of the of each ingredient does she need? one cup and banana chips ,7 tablespoons oil , two eggs, 3/4 cups flour 1/4 cup walnuts show all you work and justify your answer using a baby toulmin.

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10