Pls help explain this

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

Choose the equation below that represents the line that passes through the point (2, 4) and has a slope of 3. a) y − 4 = 3(x − 2) b) y − 2 = 3(x − 4) c) y + 4 = 3(x + 2) d) y + 2 = 3(x + 4)

Which of the following is another way to express the difference between -5 and 8?