Vivo V
Ditanya 2 hari yang lalu
Iklan
Vivo V
Ditanya 2 hari yang lalu
Pertanyaan
20. Nilai 2x + y + z dari sistem persamaan {x + 3y + z = 12 {2×+y+z=9 {×+y+2z=13 Tolong di jawab pakai cara besok di kumpulkan!!
6
1
Iklan
Monica A
Dijawab 2 hari yang lalu
<p>x + 3y + z = 12<br>2x + y + z = 9</p><p>x + y + 2z = 13</p><p> </p><p>(x + 3y + z) - (2x + y+ z) = 12-9</p><p>(x - 2x ) (3y-y) (z - z) = 12 -9</p><p>-x + 2y = 3<br>x = 2y - 3</p><p> </p><p>(x + 3y + z ) - (x + y + 2z) = 12 - 133<br>( x-x) (3y - y) (z - 2z) = -1</p><p>2y - z = -1</p><p>z = 2y +1 </p><p> </p><p>2 (2y -3) + y + (2y+1) = 9</p><p>4y - 6 + y + 2y+ 1=9</p><p>(4y + y + 2y) (-6 + 1) = 9<br>7y - 5 = 9<br>7y = 9 + 5<br>7y = 14<br>y = 14/2 = 2<br><br>x = 2y - 3</p><p>x = 2(2) -3 </p><p>x = 4 -3 =1<br><br>z = 2y + 1<br>z = 2 (2) + 1<br>z = 4 + 1 = 5 <br><br>2x + y + z </p><p>= 2 (1) + 2 + 5<br>= 2 +2 + 5<br>= 9</p><p> </p>
x + 3y + z = 12
2x + y + z = 9
x + y + 2z = 13
(x + 3y + z) - (2x + y+ z) = 12-9
(x - 2x ) (3y-y) (z - z) = 12 -9
-x + 2y = 3
x = 2y - 3
(x + 3y + z ) - (x + y + 2z) = 12 - 133
( x-x) (3y - y) (z - 2z) = -1
2y - z = -1
z = 2y +1
2 (2y -3) + y + (2y+1) = 9
4y - 6 + y + 2y+ 1=9
(4y + y + 2y) (-6 + 1) = 9
7y - 5 = 9
7y = 9 + 5
7y = 14
y = 14/2 = 2
x = 2y - 3
x = 2(2) -3
x = 4 -3 =1
z = 2y + 1
z = 2 (2) + 1
z = 4 + 1 = 5
2x + y + z
= 2 (1) + 2 + 5
= 2 +2 + 5
= 9
· 0.0 (0)
Iklan
Mau jawaban yang terverifikasi?
Tanya ke AiRIS
Yuk, cobain chat dan belajar bareng AiRIS, teman pintarmu!
LATIHAN SOAL GRATIS!
Drill Soal
Latihan soal sesuai topik yang kamu mau untuk persiapan ujian
Perdalam pemahamanmu bersama Master Teacher
di sesi Live Teaching, GRATIS!
