There are 15 plates and each plate is either 7 or 12 inches diameter. Which systems of equations do you use to find the number of 7 inch plates, x and 12 inch plates, y

The equation is x + y = 15

Step-by-step explanation:

It is given that,

There are 15 plates and each plate is either 7 or 12 inches diameter.

Let the number of 7 inch plates be x and 12 inch plates be y

To find the equation

Total number of plates = 15

By using the given information, we can write

x + y = 15

Therefore the equation is x + y = 15