Question

encontre o valor da incógnita em cada equação abaixo a) 5x + 10 = 20 b) 100c = 40+60 c) 50 = 2m-30 d) 2y – 5 =6y +20 e) a+ a+a= 10+10+70 f) 2(x+5) = 50 g) -40 = -b-20-10-5-5 h) 5 (x+5) = 10(4-x)

Answer 1

Resposta:

a) 5x = 20-10

5x= 10

x = 10/5

x= 2

b) 100c = 100

c = 100/100

c = 1

c) 50 = 2m - 30

50 + 30= 2 m

80 = 2m

80/2= m

40= m

d) 2y - 5= 6y + 20

2y - 6y= 20 + 5

-4y= 25

y= -25/4

e) a + a+ a= 10+10+70

3a = 90

a =90/3

a= 30

f) 2x + 10= 50

2 x = 50- 10

2x= 40

x= 40/2

x= 20

g) -40= -b -20 -10 -5-5

b= -20-10-5-5+40

b = 0

h)5 (x+5) = 10(4-x)

5x + 25= 40- 10x

5x + 10x= 40- 25

15x= 15

x= 15/15

x = 1