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sombreros --> y
[1] 5x + 3y = 4180
[2] 8x + 9y = 6940
Multiplicando [1] por -3 -15x - 9y = -12540
[2] 8x + 9y = 6940
Simplifica [1] y [2] -7x = -5600
x = 800
Reemplaza x en [2] 8(800) + 9y = 6940
6400 + 9y = 6940
9y = 540
y = 60