Question

8 Rezolvați ecuațiile, apoi faceți proba soluției găsite:
a 10x = 40;
b -7x=21;
f 3 = -2x + 7;
j-x+7= -23;
e-3x+15= 0;
i -18 + 6x = 6;
c 16x = 48;
g 22x + 44= 0;
k 4(x-7)= 0;
d 9x+27= 0;
h 11x +29=95;
1-3(x + 6) = 6.​

Answer 1

a) x=40/10

x=4

Proba: 10*4=40

b)x=21/-7

x=-3

Proba:-7*-3=21

f)-2x=3-7

-2x=-4

x=-4/-2

x=2

Proba: -2*2+7=3

-4+7=3

j) -x=-23-7

-x=-30

x=30

Proba: -30+7=-23

e)-3x=0-15

x=-15/-3

x=5

Proba:-3*5+15=0

-15+15=0

i)6x=6+18

6x=24

x=4

Proba:-18+6*4=6

-18+24=6

c)x=48/16

x=3

Proba:16*3=48

g)22x=0-44

22x=-44

x=-44/22

x=-2

Proba:22*-2+44=0

k)4x-28=0

4x=28

x=28/4

x=7

Proba:4(7-7)=0

4*0=0

d)9x=-27

x=-27/9

x=-3

Proba: 9*-3+27=0

-27+27=0

h)11x=95-29

11x=66

x=6

Proba:11*6+29=95

66+29=95

Ultimul ex:

-2x-12=6

-2x=6+12

-2x=18

x=18/-2

x=-9

Proba:1-3(-9+6)=6

-2*-3=6