Question

4. Rezolvati în R:
a) 5x + 7 = 3x + 17
d) 4x +2= 2x + 14
b) 6x - 1 = 2x + 7
e) 8x + 3 = 6x + 7
c) 4x +5= 2x+25
f) 2x - 5 = 7x + 25​

Answer 1

Răspuns:

Explicație pas cu pas:

a) 5x + 7 = 3x + 17

5x - 3x = 17 - 7

2x = 10

x = 10 : 2 = 5

d) 4x +2= 2x + 14

4x - 2x = 14 - 2

2x = 12

x = 12 : 2 =6

b) 6x - 1 = 2x + 7

6x - 2x = 7 + 1

4x = 8

x = 8 : 4 = 2

c) 4x +5= 2x+25

4x - 2x = 25 - 5

2x = 20

x = 20 : 2 = 10

f) 2x - 5 = 7x + 25​

7x - 2x = -5 - 25

5x = -30

x = -30 : 5 = -6

Answer 2

Explicație pas cu pas:

a)5x+7=3x+17

5x-3x=17-7

2x=10=>x=5

b)6x-1=2x+7

6x-2x=7+1

4x=8=>x=2

c)4x+5=2x+25

4x-2x=25-5

2x=20=>x=10

d)4x+2=2x+14

4x-2x=14-2

2x=12=>x=6

e)8x+3=6x+7

8x-6x=7-3

2x=4=>x=2

f)2x-5=7x+25

2x-7x=25+5

-5x=30=>x=30÷5=>x=6