Question

equaçao do primeiro grau resolva
a} -3x-17=-21
b} 2x-8=-7x
c} y+9=3
d} y+5=-3
e} -5m-7-2m-2=0
f} 7(x-1)=2(3x+1)

me ajudem pfvrr

Answer 1

a) - 3x - 17= - 21

- 3x = - 21 + 17

- 3x = - 7

x = -7/-3

x= 7/3

b) 2x - 8= - 7x

2x + 7x = 8

9x = 8

x = 8/9

c) y + 9 = 3

y = 3 - 9

y = - 6

d) y + 5 = - 3

y = - 3 - 5

y = - 8

e) - 5m - 7 - 2m - 2 = 0

- 5m - 2m = 2 + 7

- 7m = 9

m = 9/-7

m = - 9/7

f) 7 (x - 1) = 2 (3x + 1)

7x - 7 = 6x + 2

7x - 6x = 2 + 7

x = 9