Pls help as soon as possible

The number if marbles of different colors stored in a hat is listed below: 4 red marbles 10 green marbles 7 blue marbles. without looking in the hat, dan takes out a marble at random. he replaces the marble and then takes out another marble from the hat. what is the probability that dan takes out a blue marble in both draws?

X2 + y 2 = 36 x + y = 6 solve the system of equations.

Solve x+3y=6 and 4x-6y=6 by elimination . show work !