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4x+7y=45200 x3 12x+21y=135600
5x+3y=22000 x7 35x+21y=154000 -
-23x=-18400-> x= 800
5x+3y=22000
5(800)+3y=22000
4000+3y=22000
3y=18000
y=6000
3x+2y=3(800)+2(6000)=2400+12000= 14400
5x+3y= 22000 dikali 4
20x+35y= 226000 - 20x+12y= 88000
23y=138000
y= 138000'23
y= 6000
---> 5x+3y=22000
5x+3.6000=22000
5x+18000=22000
5x=4000
x= 4000/5
x= 800
jadi 3x+ 2y= 3.800+2.6000
2400 +12000
14.400
Kalau nomor satu saya tidak tau karena jawabannya koma