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4x+2y = 3900 || x2
3x+4y = 4800
8x+4y = 7800 (-)
-5x = - 3000
x = 3000/5
x = 600
3x+4y=4800
3(600)+4y=4800
1800+4y=4800
4y=4800-1800
4y=3000
y=3000/4
y=750
5x+7y= 5(600)+7(750)= 3000+ 5250= 8250