Nigel and Desmond went bowling one afternoon. They each bowled 3 games. Write and solve an equation to find how many points Desmond averaged each game.

x = 4

Step-by-step explanation:

Given the points (4, - 1) and (4, 8)

Note the x- coordinates are 4 in both cases.

This indicates the line passing through the points is vertical with equation

x = c

where c is the value of the x- coordinates the line passes through. In this case 4, thus

x = 4 ← equation of vertical line