{2a-3b=2
{5a-2b=5
4a-6b=4
15a-6b=15
(4a-6b)-(15a-6b)=4-15
-11a=-11
a=-11/-11
a=1
2a-3b=2
2(1)-3b=2
3b=2-2
b=0
a=1 b=0