The slope of the line ,ab, containing a(3,-1) and b(6,k)is 2 , what is the value of k

Iam so stuck. what is the worked out answer for this question?

In the equations, a and b represent the price per night for a room in hotel a and hotel b, respectively, w weeks after september 1 last autumn. what was the price per night in hotel a when it was equal to the price per night in hotel b? a = 240 − 20w b = 320 − 30w

Solve the x in the equation x^2+14x+17=-96