Kun-cha has 150 feet of fencing to make a corral for her horses. the barn will be one side of the partitioned rectangular enclosure, as shown in the diagram above. the graph illustrates the function that represents the area that could be enclosed.

So to graph you problem you should first consider that the one side of the bar is 150feet because it is in the other partitioned of the fence and the function of it would be 150(x) because the barn's area is calculated through it length time width. I hope this will help 

The point (5, 10) will work for the rule y=x+5.y= 10 x= 510=5+510=10therefore the ordered pair (5, 10) works for the rule