Resolva as equações do primeiro grau:
A) x+3=8
B) x-6=2
C) 3x6=12
D) 4x-7=21
E) x-7=15
F) x-5= -7
G) 5x-1= -16
H) 13x+2= -24
I) 3x+2= 2x+5
J) 6x-4= 3x+2
K) -2x+8= 3x-2
Soluções para a tarefa
Explicação passo-a-passo:
A) x = 8 - 3 => *x = 5*
B) x = 2 + 6 => *x = 8*
C) 3x = 12 - 6 => 3x = 6 =>
x = 6/3 => *x = 2*
D) 4x = 21 + 7 => 4x = 28 =>
x = 28/4 => *x = 7*
E) x = 15 + 7 => *x = 8*
F) x = -7 + 5 => *x = -2*
G) 5x = -16 + 1 => 5x = -15 =>
x = -15/5 => *x = -3*
H) 13x = -24 -2 => 13x = -26 =>
x = -26/13 => *x = -2*
I)6x - 3x = 2 + 4 => 3x = 6 =>
x = 6/3 => *x = 2*
J) 6x + 3x = 2 + 4 => 9x = 6 => *x = 6/9*
K) 8 + 2 = 3x + 2x => 10 = 5x =>
x = 10/5 => *x = 2*
Resposta:
a) x+3=8
x= 8-3
x=5
b) x-6=2
x= 2+6
x= 8
c) 3x6=12
3x=12-6
3x=6
x=6/3 > x=2
d) 4x-7=21
4x=21+7
4x=28
x=28/4 > x= 7
e)x-7=15
x=15+7
x=22
f) x-5=-7
x= -7+5
x= -2
g) 5x-1=-16
5x=-16+1
5x=-15
x=-15/5 > x=-3
h) 13x+2=-24
13x=-24-2
13x=-26
x= 26/13 > x= -2
i) 3x+2=2x+5
3x-2x=+5-2
x=3
j) 6x-4=3x+2
6x-3x=+2+4
3x= 6
x= 6/3 > x= 2
k) -2x+8=3x-2
-2x-3x=-2-8
-5x= 2-8
-5x=-10
x= -10/-5 > x= -2