Use the dartboard at the right. (19 for bullseye and 8 for anywhere else) can you score exactly 100 points with seven darts that all land on the board?

X = bullseye's and y = other

x + y = 7x = 7 - y
19x + 8y = 100

19(7 - y) + 8y = 100
133 - 19y + 8y = 100
-11y = 100 - 133
-11y = -33
y = 3

x + y = 7
x + 3 = 7
x = 7 - 3
x = 4

yes, u can score 4 bullseye's and 3 other shots to reach exactly 100 points.