Pls help explain this

What is the slope of the line shown below?

What is the value of x in the equation 2(x-4) = 4(2x + 1)?

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?