NILAI X & Y yg memenuhi SPLDV 2/3X DITAMBAH 3Y=7 4x DIKURANG 5Y=9

2/3x+3y=7
2x+9y=21
4x+18y=42
4x-5y=9
KURANGI
23y = 33
y= 33/32
y=1,03125

4x-5(33/32)=9
4x=9+5,15625
x=14,15625/4
x=3,5390625

mudah sekali bukan