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3x+4y = 20
3x-6y = -7
---------------- -
10y = 27
y = 2,7
substitusi
3x+4y = 20
3x+4(2,7) = 20
3x + 10,8 = 20
3x = 9,2
x = 3,07
3x+ 4y=20
3x - 6y = -7
(menggunakan metode eliminasi) --> dikurang
sehingga tersisa 4y-(-6y)= 20-(-7)
10y = 27
y=2,7
3x+4y = 20
3x+4(2,7)=20
3x= 20-10,8
3x= 9,2
x= 3,06
x = 3
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maaf kalau salah :)