Answer:
The cost of a combo meal is $8 and a salad is $4.
Step-by-step explanation:
You have to form simultaneous equations with the given informations. Let combo meal be m and salad is s :


Next, you have to solve these equations :







No they should multiplied before adding
The answer is the last graph, the equation says that y is greater than the equation making it a dashed line that is shaded above it