Question

determine o valor de ×:

a) 4×+10=2 ×+90

b) 5×-10=2 ×+80

c) 3×+20= × + 120

d) 6×- 40= - 4 × + 260

e) 7× - 80= 2 × + 290​
rapidooo

Answer 1

Explicação passo-a-passo:

A) 4x + 10 = 2x + 90

4 x - 2 x = 90 - 10

2 x = 80

x = 80/2

x = 40

B) 5 x -10 = 2x + 80

5 x - 2x = 80 + 10

3 x = 90

x = 90/3

x = 30

C) 3 x + 20 = x + 120

3 x- x = 120 - 20

2 x = 100

x = 100/2

x = 50

D) 6 x - 40 = - 4x + 260

6 x + 4x = 260 + 40

10 x = 300

x = 300/10

x = 30

E) 7 x -80 = 2x + 290

7 x - 2x = 290 + 80

5 x = 370

x = 75