The standard form of the equation of circle is:
(x – h)^2 + (y – k) ^2 = r^2
Where the center being at the point (h, k) and the radius
being r
Substituting the values to the equation:
(-15 - (-7)) ^2 + (y – (-1)) ^2 = 13^2
64 + (y +1) ^2 = 169
(y +1) ^2 = 105
y + 1 = 10.247
y = 9.247
