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2x - 3y = 7 ( dikali 3 )
3x + 2y = 4 ( dikali 2 )
= 6x - 9y = 21
6x + 4y = 8
------------------ -
-13y = 13
y = 13/-13
y = -1
Nah sekarang kan udah dapet nih b nya,masukkin deh ke persamaan tadi,biar dapet berapa a nya.
2x - 3y = 7
= 2x + 3 = 7
= 2x = 7-3
2x = 4
x = 2
Udah dapet a = 2 , b = -1
tinggal jumlah a - b
= 2 - ( -1 )
= 2 + 1
= 3
Jadi,jawabannya adalah 3
semoga membantu ;) jangan lupa jadikan jawaban terbaik yaa hehehe