A nutritionist is creating a meal plan that provides a total of 1800 calories from two main sources: protein and carbohydrates. Each gram of protein provides 4 calories, and each gram of carbohydrate provides 4 calories. The graph shows the relationship between the number of grams of protein, , and the number of grams of carbohydrates, , that can be included in the meal plan to meet the 1800-calorie target. What does the slope of this line represent in this context?
The total number of calories in the meal plan.
The ratio of calories per gram of protein to calories per gram of carbohydrate.
The decrease in grams of carbohydrates for each additional gram of protein to maintain the total calorie target.
The total grams of protein and carbohydrates combined.
