The midpoint of the line segment for P1 to P2 is (-3,1). If P1=(-3,4), what is P2

Any and all help is greatly appreciated.

Let,
P2(x, y), and given that P1(-3, 4)
then,
(x+3)/2 = -3, ===> x+3 = -6,
x = -6-3 = -9,
Also,
(y-4)/2 = 1, ===> y-4 = 2,
y = 2+4 = 6
Hence,
P2 is : (-9, 6) >=========================< ANSWER