Explanation:
Q3: Observe the 2 points indicated. To get from the bottom point to the top point, one would have to move 3 units up and 1 unit to the right. The slope is therefore 3/1 = 3.
Q4: Similarly, to get from the bottom point to the top point, one would now have to move 3 units up and 2 units to the right. The slope here is 3/2.