In mathematics learning, it is an important method to summarize and organize knowledge in time. Xiao Ming, who is good at learning, summarized and sorted out the relevant knowledge after learning equations (groups), linear inequalities and linear functions.

(1) For example, he drew the images of elementary functions y=x+2 and y=-x+4 in the same rectangular coordinate system (as shown in figure 1) and summarized them as follows:

Please write the corresponding conclusion after the following figures according to the contents in Figure 1 and the box above:

①

-x+4=0

-x+4=0

; ②

x+2=0

x+2=0

; ③

x+2>0

x+2>0

; ④

-x+4