Given that the set P = {(x, y) │ y = k, X ∈ R, K is constant}, q = {(x, y) │ y = (a ^ x) 1, a > 0, a ≠ 1, X ∈ r}, P ∩ q = has only one subset, then the value range of K?

Given that the set P = {(x, y) │ y = k, X ∈ R, K is constant}, q = {(x, y) │ y = (a ^ x) 1, a > 0, a ≠ 1, X ∈ r}, P ∩ q = has only one subset, then the value range of K?

P ∩ q = only one subset is empty
Q={(x,y)│y=(a^x) 1,a>0,a≠1,x∈R} y>0
P = {(x, y) │ y = k, X ∈ R, K is constant} y=