Can you please just answer the question 1 have below, that's where I am lost. Thanks ystem, points (2,9) and (-1,0) lie on line k. 5 on line k, what is the value of n? (7,21) y = mx + b y = 3x + b (2,9) 9-3(2) + b = 3 y = 3x +3 X slope Y-Y X₂-X, How do you get to 3 here? I see 3x9=6 and then I don't get what steps came in between