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2x+2y = 17000
dikurang (eliminasi)
= 3x = 10500
= x = 3500
2 (3500) +2y = 17000
7000 + 2y = 17000
2y = 17000-7000
2y = 10000
y = 5000
3x+2y = 3(3500)+2(5000)
= 10500+10000
=20500
Jadi harga 3 pensil dan 2 pulpen adalah Rp.20.500
Pulpen : y
5x + 2y = 27.500 ...(1)
2x + 2y = 17.000 ...(2)
5x + 2y = 27500 | x2 => 10x + 4y = 55000
2x + 2y = 17000 | x2 => 4x + 4y = 34000
----------------------(-)
6x = 21000
x = 21000/6 = 3500
2x + 2y = 17000 | x5 => 10x + 10y = 85000
5x + 2y = 27500 | x2 => 10x + 4y = 55000
----------------------- (-)
6y = 30000
y = 30000/6 = 5000
harga 1 pensil (x) = 3500 x 3 = 10500
harga 1 pulpen (y) = 5000 x 2 = 10000
-------(+)
jadi harga 3 pensil dan 2 pulpen Rp. 20.500
insya allah bener