Solve using substitution

x=-10
2x+4y=4

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?

What ia the sum if the first 7 terms of the geometric series

If the tip varies directly with the number of guest which equation represents between the tip,t, and the number of guest,g?