Joel wants to determine the solution to 0.5^x+4 ≤ 2. He first graphs 0.5^x+4-2 ≤ y as shown. Joel then graphs y ≤ 2 on the same coordinate plane and claims that the solution set to 0.5^x+4 ≤ 2 is the interval [6, infinity), because the overlapping region matches this interval. which statement describes Joel's error?