Bonsoir,
8*x +1= 40 -5*x
x= 1
8*x +1=8+1= 9
40 -5*x= = 40- 5 = 35
35 ≠9
faux!
x= 2
8*x +1= 8*2 +1 = 16 +1 = 17
40 -5*x = 40 - 5*2 = 40 -10 = 30
17≠30
faux
x=3
8*x +1= 8* 3+ 1 = 24+1 =25
40 -5*x =40 -5*3= 40 - 15 =25
25=25
Vrai
