What is into relation with suitable example​

Find the slope of the line y =8/9x + 1.

Brent wants to know what is 5 x 1/2

The general form of the quetion of a circle is ax^2+by^2+cx+dy+e=0 where a=b=0 if the circle has a radius of three units and the center lies on the y axis which set of values of a, b, c, d, and e might correspond to the circle