Can someone help me plz

Is this a polynomial function? i need to know asap

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

Which equation represents a direct linear variationa. y=x2b. y=2/5xc. y=1/xd. y=x+3