Linear equations have the form y= mx + b. Which of the given equation is linear?

Aphoto of a painting measured 13 x 17 inches the scale of the photo to the original painting is 1 inch to 3 inches. what is the size of this painting

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

If the class was going to get a class pet and 5 picked fish and 7 pick bird and 8 picked rabbits have many students were in the