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2a+5b= -4
hacemos reduccion:
10a-3b=36..........................10a-3b=36
-5(2a+5b= -4).....................-10a-25b=20
-28b=56...........b=56/-28..............b= -2
si b= -2
2a+5b= -4
2a+5(-2)= -4
2a-10= -4
2a=10-4
2a=6
a=6/2
a=3
solucion:
a=3 b= -2