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3x+2y=15
x-y=-5 (-3)
3x+2y=15
-3x+3y=15
3x+2y=15
---5y=30
y=6
remplazando:
x-y=-5
x-6=-5
x=1
.....................................
2a+B=9
a-2B=-8
2a+B=9(2)
a-2B=-8
4a+2B=18
a-2B=-8
5a=10
a=2
remplazando:
2a+B=9
4+B=9
B=5
esperó que te sirva :)