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pensil =y
8x+6y =14.400 ×5
6x+5y = 11.200 ×6
____________
40x+30y =72.000
36x+30y =67.200
______________-
4x=4800
x=1200
6x+5y = 11200
6×1200+5y=11200
7200+5y=11200
5y = 4000
y= 800
5x+8y = 5×1200+8×800 = 6000+6400=12400