soit x les tee shirts et y les jeans
5 x + 2 y = 680
4 x + y = 460
- 8 x - 2 y - 920
- 3 x = - 240
x = 80
tee shirt = 80 F
5 * 80 + 2 y = 680
400 + 2 y = 680
2 y = 680 - 400 = 280
y = 140
jean = 140 F
5 * 80 + 2 * 140 = 400 + 280 = 680
4 x 80 + 140 + 600 = 320 + 140 + 600 = 1060
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soit x les tee shirts et y les jeans
5 x + 2 y = 680
4 x + y = 460
5 x + 2 y = 680
- 8 x - 2 y - 920
- 3 x = - 240
x = 80
tee shirt = 80 F
5 * 80 + 2 y = 680
400 + 2 y = 680
2 y = 680 - 400 = 280
y = 140
jean = 140 F
5 * 80 + 2 * 140 = 400 + 280 = 680
4 x 80 + 140 + 600 = 320 + 140 + 600 = 1060