Question

resolva as equações

a) 2x+12=16

b) 4y - 10= 30

c) 12x+ 3x - (-10) = 0

d) 18x + 20x + (-38)= 0

e) 2(x + 5) - (-10) =0

f) -2 ( y-4) = 0

g) -12(4 - y) + (-12)= 0

Answer 1

a) 2x+12=16
    2x = 16 -12
    2x = 4
      x = 4/2
      x = 2

b) 4y - 10= 30
    4y = 30 +10
    4y = 40
      y = 40/4
      y = 10

c) 12x+ 3x - (-10) = 0
    12x +3x +10 = 0
    12x +3x = -10
    15x = -10
        x = -10/15 simplificando por 5
        x = -2/3

d) 18x +20x + (-38)= 0
     18x +20x -38 = 0
      38x = 38
          x = 38/38
          x = 1   

e) 2(x + 5) - (-10) =0
    2x +10 +10 = 0
    2x = -10 -10
    2x = -20
      x = -20/2
      x = -10

f) -2 ( y-4) = 0
   -2y +8 = 0
   -2y = -8
      y = -8/-2
      y = +4

g) -12(4 - y) + (-12)= 0
    -48 +12y -12 = 0
    12y = 48 +12
    12y = 60
        y = 60/12
        y = 5

Answer 2

A) 2x +12 =16
2x = 16-12
2x=4
x=4/2
x=2

B) 4Y -10 =30
4y =30+10
y=40/4
y=10

C)12x + 3x -(-10) = 0
15x + 10=0
15x=-10
x=-10/15 (simplificado é -2/3)
x=-0,6666

D) 18x +20x + (-38) =0
38x -38=0
38x=38
x=38/38
x=1

E) 2(x +5) -(-10)=0
2*x + 2*5 +10 =0 
2x + 10 + 10 =0
2x +20 = 0
2x=-20
x=-20/2
x=-10

F) -2 (y -4) = 0
-2*y +((-2)*(-4))=0
-2y+8=0
-2y=-8
y=-8/-2
y=4

G) -12(4-y) + (-12) =0
-12*4+ ((-12)*(-y)) -12=0
-48 + 12y -12=0
12y=12+48
12y=60
y=60/12
y=5

espero ter ajudado !