Jika 2x + 5y = 11 dan 4x-3y=-17 tentukanlah nilai dari 2x – y
Jawaban Terkonfirmasi
2x + 5y = 11 I x2 I
4x – 3y = -17 I x1 I
—————————–
4x + 10y = 22
4x – 3y = -17
————————- –
13y = 39
y = 39 / 13
y = 3
2x + 5y = 11
2x + 5(3) = 11
2x + 15 = 11
2x = 11 – 15
2x = -4
x = -4 / 2
x = -2
maka
2x – y
= 2(-2) – 3
= -4 – 3
= -7
2x +5y=11
4x-3y=-17
—————
4x+10y=22
4x-3y=-17
—————
13y=39
y=3
4x-3y=-17
4x-3(3)=-17
4x=-17+9
4x=-8
x=-2
jadi 2x-y = 2(-2)-3
=-4-3
=-7