Yes, it is possible to print a landscape photo with the dimensions of 5x7 in inches, but the 7-inch side is presented horizontally. It can be helpful for landscapes, group photos and larger shots, as Visuals Clipping states, because it gives them a rectangular shape. But the image may be of a different size, which means that some cropping might be necessary. Reading the composition before printing can help you to place main subjects correctly and not be cutting away important detail at the edges.