Question

1) determine a raiz de cada equaçâo a seguir (resolva descobrindo o valor da variavel desconhecida) considerando u = q
a)5x + 4 - 2x = 26 -3x
b)5m - 7 - 2m - 2 = 0
c) y - 8 + 5y =-3 +2y +7
d)3(x + 2) + 5 = x + 12
e) x + 4 (x - 1) = 9 - 2 (x + 3)
f)5 (3x - 2) = 2 (6x + 3)
g)2 (3x - 1)+ 2 (3 - x)
h)7 (x - 1) = 2 (3x + 1)
i)2(3 - y) + 7 (2 - y) = 15 - 4y
j)2 (x - 2) + 5 (2 - x) + 6 (x + 1)= 0
k)3 (x - 2) - (1 - x ) =13
l) x - (x + 1) =12 - (3x - 2 )

Answer 1

a)
5x-2x+3x=26-4
6x=22
x=22/6 ou 11/3

b)
5m-2m=7+2
3m=9
m=9/3
m=3

c)
y+5y-2y=-3+7+8
4y=12
y=12/4
y=3

d)
3*x+3*2+5=x+12
3x+6+5=x+12
3x-x=12-6-5
2x=1
x=1/2 ou 0,5

e)x+4*x+4*(-1)=9-2*x-2*3
x+4x-4=9-2x-6
x+4x+2x=9-6+4
7x=7
x=7/7
x=1

f)
5*3x-5*2=2*6x+2*3
15x-10=12x+6
15x-12x=6+10
3x=16
x=16/3

g) 2*3x-2*1+2*3-2*x=
6x-2+6-2x=
6x-2x=2-6
4X=4
X=4/4
X=1

h)
7*x-7*1=2*3x+2*1
7x-7=6x+2
7x-6x=2+7
x=9

i)
2*3-2*y+7*2-7*y=15-4y
6-2y+14-7y=15-4y
-2y-7y+4y=15-6-14
-5y=-3
y=-3/-5= 3/5

j)
2*x-2*1+5*2-5*x+6*x+6*1=0
2x-2+10-5x+6x+6=0
2x-5x+6x=2-10-6
3x=-14
x=-14/3

k)
3*x-3*2-1+x=13
3x-6-1+x=13
3x+x=13+6+1
4x=20
x=20/4
x=5

l)
x+x-1=12+3x+2
x+x-3x=12+2+1
-x=15
x=-15