2*0+4 = 4 2*1+1=3 pas 4 2*1+2=4 2*2+0=4 0-2=-2 pas 2 1-1=0 pas 2 1-(-1)=2 2-0=2
(2;0) car vérifie les 2 équations
en faisant comme dans le 12 pour chaque solution proporY
droite rouge droite bleue
droite grise
2 (2;3) intersection 3
(-1 ; 0) intersection
-2
4
(-2 ; 4) intersection
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1) proportionnalité : 100 kms 5 litres
250 kms
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250*5/100 = 12.5 litres consommés reste donc 45 - 12.5 = 32.5 litres
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100 5 x 5x100
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2)
y = -0.05x + 45
droite croissante je vous laisse faire
reste 5 litres donc y =5 5 = -0.05x + 45
5-45 = -0.05x
x = -40/-0.05 = 800
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32 212
100 = 1.8x + 32 donc 100-32 = 1.8x x = 68/1.8 = 37.78 °C
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1) on prend deux points (0 ; 12000) et (1 ; 12100)
on trouve
on fait comme dans des exos précédents
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2
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y = 50x + 12000
10
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12500
12500
50*10+12000
6
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12300 = 50x + 12000 donc x = 300/50 x = 6
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82.5 132.5 232.5 32.5+0.1*500
32.5+0.1*1000
32.5+0.1*2000
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y = 32.5 + 0.1x = 0.1x + 32.5
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185 = 0.1x + 32.5 donc 185-32.5 = 0.1x donc x = 152.5/0.1 = 1525 kWh
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