Jika 2x + 5y = 11 dan 4x – 3y = -17, Maka nilai dari 2x – y

2x + 5y = 11 |×2
4x - 3y = - 17
maka
4x + 10y = 22
4x - 3y = - 17
-------------------(-)
13y = 39
y = 3

subtitusi
2x + 5y = 11
2x + 5(3) = 11
2x + 15 = 11
2x = 11 - 15
2x = - 4
x = - 2

nilai 2x - y
= 2(-2) - 3
= - 4 - 3
= - 7

[tex]2x + 5y = 11 \\ 4x - 3y = - 17 \\ elimimasi klikn \: ats \: 2bwh1 \\ 4x + 10y = 22 \\ 4x - 3y = - 17 \\ 13y = 39 \\ y = 3 \\ subskn \: nilai \: y \\ 2x + 5(3) = 11 \\ 2x = 11 - 15 \\ 2x = - 4 \\ x = - 2 \\ maka \: nilai \: 2x - y = 2( - 2) - 3 = - 4 - 3 = - 7[/tex]
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