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4x + 2y +3z = 26000
3x + 3y +z = 21500
3x +z =12500
3x + 3y +z = 21500
3x +z =12500
-
3y = 9000
y = 3000
4x + 2.3000 + 3z = 26000
(4x + 3z = 20000).3 => 12x + 9z = 60000
(3x + z = 12500).4 =>12x + 4z = 50000
-
5z = 10000
z = 2000
2y = 2.3000= 6000 (bolpin)
2z = 2.2000=4000 (pensil)
total = 10.000 (D)
no.10
3x + 2y +z= 16600
y + 250 = 2x = > 2x - y = 250
z + 900 =2y =>2.(2x - 250) = z + 900 => 4x + 500 = z + 900
(4x - z = 400).2
8x - 2z =800
3x + 2y +z= 16600
2y - z = 900
-
3x + 2z =15700
8x - 2z =800
+
11x = 16500
x = 1500
4x - z = 400
4.1500 - z = 400
z =5600
ditanya 4x+ 2z = 6000 + 11200 =17200 (b)