Question 958390
Let the number of points scored 
by the end of the season
for the 3 players =
{{{ S }}}, {{{ L }}}, and {{{ K }}}
--------------------------
(1) {{{ S = L + 8 }}}
(2) {{{ L = 2K }}}
(3) {{{ S + L + K = 108 }}}
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There are 3 equations. This is very important
because the number of equations has to 
match the number of unknowns, or you
won't be able to solve it.
--------------------------
(2) {{{ K = L/2 }}}
Substitute (1) and (2) into (3)
(3) {{{ L + 8 + L + L/2 = 108 }}}
(3) {{{ 2L + L/2 + 8 = 108 }}}
Multiply both sides by {{{ 2 }}}
(3) {{{ 4L + L + 16 = 216 }}}
(3) {{{ 5L = 200 }}}
(3) {{{ L = 40 }}}
and
(2) {{{ K = L/2 }}}
(2) {{{ K = 40/2 }}}
(2) {{{ K = 20 }}}
and
(1) {{{ S = L + 8 }}}
(1) {{{ S = 40 + 8 }}}
(1) {{{ S = 48 }}}
--------------------
Sapple scored 48
Lapin scored 40
Kapp scored 20
---------------
check:
(3) {{{ S + L + K = 108 }}}
(3) {{{ 48 + 40 + 20 = 108 }}}
(3) {{{ 108 = 108 }}}
OK