Tentukan x,y,z x + y = 9 2y + 3z = 7 x - 2z = 4
Matematika
novi876
Pertanyaan
Tentukan x,y,z
x + y = 9
2y + 3z = 7
x - 2z = 4
x + y = 9
2y + 3z = 7
x - 2z = 4
1 Jawaban
-
1. Jawaban Ayunurrhidayah
x + y = 9
x = 9 - y
2y + 3z = 7
x - 2z = 4
9-y -2z = 4
-y - 2z = 4 - 9
-y - 2z = -5
eliminasi
2y + 3z = 7 (x1) 2y + 3z = 7
-y - 2z = -5 (x2) -2y - 4z = -10 (dijumlah)
-z = -3
z = 3
2y + 3z = 7
2y + 3(3) = 7
2y + 9 = 7
2y = 9 - 7
2y = 2
y = 1
x + y = 9
x + 1 = 9
x = 9 - 1
x = 8
x = 8
y = 1
z = 3