Rima membeli 4 papan penjepit dan 8 pensil harga Rp80.000. Ali membeli 3 papan penjepit dan 10 pensil harga Rp70.000.berapa harga 1 papan penjepit dan 1 pensil? tolong dijawab dan beserta caranya terimakasih
Ridafahmi
Misal : papan penjepit = x pensil = y 4x + 8y = 80000 ×5 20x + 40y = 400000 3x + 10y = 70000 ×4 12x + 40y = 280000 - 8x = 120000 x = 120000/8 x = 15000 4x + 8y = 80000 4 . 15000 + 8y = 80000 60000 + 8y = 80000 8y = 80000 - 60000 8y = 20000 y = 20000/8 y = 2500 jadi harga 1 papan penjepit Rp 15.000 dan 1 pensil Rp 2.500
pensil = y
4x + 8y = 80000 ×5 20x + 40y = 400000
3x + 10y = 70000 ×4 12x + 40y = 280000 -
8x = 120000
x = 120000/8
x = 15000
4x + 8y = 80000
4 . 15000 + 8y = 80000
60000 + 8y = 80000
8y = 80000 - 60000
8y = 20000
y = 20000/8
y = 2500
jadi harga 1 papan penjepit Rp 15.000 dan 1 pensil Rp 2.500