Sagot :
[tex]a)-7x + 15 = 2x - 3[/tex]
[tex]-9x=-3-15[/tex]
[tex]-9x=-18[/tex]
[tex]x=2[/tex]
[tex]b) 4t - 3 =-10t +4[/tex]
[tex]14t=4+3[/tex]
[tex]14t=7[/tex]
[tex]t=\frac{1}{2}[/tex]
[tex]c) 6x -10 = 7x + 3[/tex]
[tex]6x-7x=3+10[/tex]
[tex]-x=3+10[/tex]
[tex]-x=13[/tex]
[tex]x=-13[/tex]
[tex]d)y+1 = - 3y + 4[/tex]
[tex]y=-3y[/tex]
[tex]y+3y=0[/tex]
[tex]4y=0[/tex]
[tex]y=0[/tex]
Exercice 27 - Équations
a)
-7x + 15 = 2x -3
-7x -2x = -3 -15
-9x = -18
x = [tex]\frac{-18}{-5}[/tex]
x = 2
b)
6x -10 = 7x + 3
6x -7x = 3 + 10
-x = 13
x = -13
c)
4t -3 = -10t + 4
4t + 10t = 4 + 3
14t = 7
t = [tex]\frac{7}{14}[/tex]
t = 0,5
d)
y + 1 = -3y + 4
y +3y = 4 -1
4y = 3
y = [tex]\frac{3}{4}[/tex]
y = 0,75