Solve by graphing y = -3 y = 6x - 3

Can someone me out here and the tell me the greatest common factor

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

Which values of p and q result in an equation with exactly one solution? px-43=-42x+q choose all answers that apply: a) p=-43 and q=-43 b) p=42 and q=43 c) p=43 and q=−42 d) p=42 and q=42