Let points scores by:
Darius be "d"
Ken be "k"
Devonte be "e"
Juwan be "j"
Now,
Darius scored 4 more than Ken, we can write:
d = 4 + k
Devonte scored twice as ken, we can write:
e = 2k
Juwan scored 7 more than 5 times ken, we can say:
j = 5k + 7
Four of them scored 479 total, we can write:
d + k + e + j = 479
Now, we have to solve all these 4 together and find our answer:
Putting the first 3 equations into last one we can solve for k:

Now,
d = 4 + k
d = 4 + 52
d = 56
and
e = 2k
e = 2(52)
e = 104
j = 5k + 7
j = 5(52) + 7
j = 267
So,
Darius = 56 points
Ken = 52 points
Devonte = 104 points
Juwan = 267 points