Tri scored a total of 31 points in the basketball game, and he scored p points in the second half of the game. Write an expression to determine the number of points he scored in the first half of the game. Then, find the number of points he scored in the first half of the game if he scored 7 points in the second half of the game.

If he scored x points in the first half, then

x+p = 31
now do part (b)

To determine the number of points Tri scored in the first half of the game, we can subtract the points he scored in the second half (p) from the total points he scored (31). Therefore, the expression to determine the number of points he scored in the first half is 31 - p.

If Tri scored 7 points in the second half of the game, we can substitute p with 7 in the expression. Therefore, the number of points he scored in the first half of the game is 31 - 7, which equals 24 points.

To write an expression to determine the number of points Tri scored in the first half of the game, we can subtract the number of points he scored in the second half of the game (p) from the total number of points he scored in the game (31).

Hence, the expression would be: 31 - p

To find the number of points Tri scored in the first half of the game if he scored 7 points in the second half, substitute p with 7 in the expression:

31 - 7 = 24

Therefore, Tri scored 24 points in the first half of the game when he scored 7 points in the second half.