The axis of symmetry would be x=0
        
             
        
        
        
Answer:
(0,3) and (7,0) are solutions.
Step-by-step explanation:
In a pair of coordinates, they are always listed as (x,y). Since this is the case, you plug in each coordinate to their respective places. 
For (0,3)
3(0) + 7(3) = 21
0 + 21 = 21
For (7,0)
3(7) + 7(0) = 21
21 + 0 = 21
To double check that (1,2) isn't a solution:
3(1) + 7(2) = 21
3 + 14 = 21
17 = 21 X
This doesn't work.
Marking as Brainliest is much appreciated. 
 
        
             
        
        
        
The equation of the circle is :   +
 +  + 6.4
 + 6.4 + 4.2
 + 4.2 = 3.84
 = 3.84
<h3>Meaning of a Circle</h3>
A circle is a loci or a continuous line that equidistant from the center to any point on the line. it drawn starting from a point and ending on that same  point. 
The equation of a circle is an equation used to find points on a circle so the circle can be drawn with accurate measurement. it can also be used to find the missing points.
In conclusion, The equation of the circle is :   +
 +  + 6.4
 + 6.4 + 4.2
 + 4.2 = 3.84
 = 3.84
Learn more about equation of a circle: brainly.com/question/1506955
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Answer:
   
Step-by-step explanation:
Where p is the distance from focus to vertex, the equation of the parabola with focus at (0, p) is ...
   
Your parabola has p=9, so the equation is ...
   