You count the distance between one point and another, in this case from one point to the next is three up and four to the right, therefore your slope is 3/4 which means 3 up 4 to the right this positive numbers mean positive direction.
The probability of getting two heads on two coin tosses is 0.5 x 0.5 or 0.25. A visual representation of the toss of two coins. The Product Rule is evident from the visual representation of all possible outcomes of tossing two coins shown above.