In the given expression what operation comes first? 10-20/4(6)

1.) 2x + y = 3 2.) x - 2y = -1 if equation 1 is multiplied by 2 and then the equations are added, the result is a.3x = 2 b.3x = 5 c.5x = 5

F(x)=5/6x+3 which of the following is true

The collection of beautiful oil paintings currently on display at an art gallery well defined; set not well defined; not a set