3x + 1/5y = 7 what is Y

Which of the fallowing best completes the sequence 5,10,15, a) 30 b) 22 c)25 d)35

The center of a circle represent by the equation (x+9)^2+(y-6)^2=10^2 (-9,6), (-6,9), (6,-9) ,(9,-6)

How do the definitions, properties, and postulates you've learned about line segments, parallel lines, and angles to define the shapes of polygons