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y = 3x - 1 diubah menjadi -3x + y = 1.
Metode eliminasi :
-3x + y = 1
3x + 4y = 11 +
5y = 10
y = 10/5
y = 2
substitusikan y = 2 ke 3x + 4y = 11,
3x + 4(2) = 11
3x + 8 = 11
3x = 11 - 8
3x = 3
x = 3/3
x = 1
maka diperoleh, 2x - 7y = 2(1) - 7(2)
= 2 - 14
= - 12
semoga bermanfaat dan bisa dimengerti ya..