Anyone know how to do this?

Identify a1 and r for the geometric sequence an= -256(-1/4) n-1

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

Pls never taught i’m really confused and i rlly need