What is the difference between intersecting lines and concurrent lines ?

What is the difference between inter secting lines and concurrent lines ?

Which of the following are not intersecting lines?

Draw intersecting and non-intersecting lines of each?

Find k, if the equation 2x^(2) + kxy - 6y^(2) + 3x + y + 1 = 0 represents a pair of lines. Find the point of intersection of the lines and angle between the lines for this value of k.