jika penyelesaian sistem persamaan 2x-3y=7 dan 3x+2y=4 adalah x=a dan y=b,maka nilai a-b=

Jawaban d.

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2x – 3y = 7 .... ×2
3x + 2y = 4 .... ×3

4x – 6y = 14
9x + 6y = 12
__________ +
13x = 26
x = 26/13
x = 2

3x + 2y = 4
3(2) + 2y = 4
6 + 2y = 4
2y = 4 – 6
2y = –2
y = –2/2
y = –1

x = a = 2
y = b = –1

a – b = 2 – (–1)
a – b = 3