Determine whether the given number is an irrational number or a rational number and place it in it’s representing category

How do i do this using elimination 2x+3y=12 x-y=6

Which formula finds the probability that a point on the grid below will be in the blue area? p(blue) = total number of squares number of blue squares number of blue squares p(blue) = total number of squares number of blue squares p(blue) = number of white squares

Does anyone know how to do geometryme with this problem