Final answer:
The value of s is 4.
Step-by-step explanation:
To find the value of s, we can use the formula for the slope of a line:
slope = (y2 - y1) / (x2 - x1)
Using the given points (7,0) and (8,s), we can plug the values into the formula:
4 = (s - 0) / (8 - 7)
By simplifying and solving for s, we get s = 4 * (8 - 7) = 4.