Please answer these math sums (coordinate geometry- circle)?

1) Find the equation of a circle whose center is on 2x+5y=1 and passing through (2,3) and (1,5)

2) Find the equation of a circle which is concentric with the circle x^2 + y^2 + 4x - 6y + 11 = 0 and passes through (2,4)

Thank you..
3 answers 3