Please answer these question(s)! It has to do with math statistics. I will give you brainliest and thanks! Please answer my other questions!

Which graph represents the equation y =4x

Find the nonpermissible replacement for binthis expression.b2/5b +5

Which ordered pair is the best estimate for the solution of the system of equations? the graph of the system of equations : y = 3/2x +6 and y=1/4x - 2 , -3) .5, -3.5) , -4) , -3.5)