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x+y= 650
20000x+15.00y= 1.100.000 sederhanakan jadi, 20x +15y=1.100
kali
x+y= 650 ║ ×20 ║
20x +15y=1.100 ║×1 ║
20x ⁺20y=1.300║
20x⁺15y= 1.100║⁻
5y=2000
y=40
x+y= 650
x+40=650
x=610 jadi,banyak yg terjual kelas 1 adalah 610 kelas 2 adalah 40