Answer:
Step-by-step explanation:
The equation is given as:

Upon solving this equation, we have

which can be written as:
(1)
Thus, the y- coordinate of the center of the circle is
.
Now, comparing the equation (1) with the equation of circle, we have

where r is the radius of the circle and (a,c) is the center.
Thus, on comparing, we have
⇒
Also, it is given that the radius of the circle is 7 units, thus putting r=7 in above equation, we get
⇒
⇒
⇒
Thus, the value of b is 44 units in the given equation.