bonjour
1) on sait que la droite passe par le point (0,0) et de pente 3
y=mx+p
y=3x+p
0=3*0+p
0=0+p
p=0
y=3x+0
y=3x
b)6=-2.5*-5+p
6=12.5+p
p=6-12.5
p=-6.5
y=-2.5x-6.5
2)a=yb-ya/xb-xa
a)4-7/1+2=-3/3=-1
7=-1*-2+p
7=2+p
p=7-2
p=5
y=-1x+5
b)2+1/10-4=3/6=1/2
-1=1/2*4+p
-1=2+p
p=-1-2
p=-3
y=1/2x-3
c)-7+4÷2/3-2/3=-3÷0=-3
-4=-3*2/3+p
-4=-2+p
p=-4+2
p=-2
y=-3x-2
d)-1/3-5/6÷1/4/-3/2=-7/6÷-5/4=-7/6*-4/5=14/15
5/6=14/15*3/2+p
5/6=7/5+p
p=5/6-7/5
p=-17/30
y=14/15x-17/30
e)-2.7-1.5÷3/4+1=-4.2÷7/4=-4.2*4/7=-2.4
-2.7=-2.4*3/4+p
-2.7=-9/5+p
p=-2.7+9/5
p=-9/10
p=-0.9
y=-2.4x-0.9
*=multiplier
