Which graph represents a function?

The line y = x + passes through (−3, 7) and is parallel to y = 4x − 1.

Beth makes batches of bluberry muffins and banna muffins. each batchis 6 muffins. she makes 2.5 batches of bluberry muffins. how many batches of bananna muffins should beth make if she wants to have a total of 60 muffins?

When y’all answer can y’all explain too !