Question

resolva as equações:

a)x+5=8
b)4=x-10
C)3x-13=8
d)2x=14
e)9x-2=4+18
f)2(x+5)-4=26
g)3(x+2)=2(x-7)
h)7y-10=y+50

me ajudem por favor,tenho que entregar amanhã!​

Answer 1

a)

$x + 5 = 8 \\ x = 8 - 5 \\ x = 3$

b)

$x - 10 = 4 \\ x = 4 + 10 \\ x = 14$

c)

$3x - 13 = 8 \\ 3x = 8 + 13 \\ 3x = 21 \\ x = \frac{21}{3} \\ x = 7$

d)

$2x = 14 \\ x = \frac{14}{2} \\ x = 7$

e)

$9x - 2 = 4 + 18 \\ 9x - 2 = 22 \\ 9x = 22 + 2 \\ 9x = 24 \\ x = \frac{24}{9}$

f)

$2(x + 5) - 4 = 26 \\ 2x + 10 - 4 = 26 \\ 2x + 6 = 26 \\ 2x = 26 - 6 \\ 2x = 20 \\ x = \frac{20}{2} \\ x = 10$

g)

$3(x + 2) = 2(x - 7) \\ 3x + 6 = 2x - 14 \\ 3x - 2x = 14 - 6 \\ x = 8$

h)

$7y - 10 = y + 50 \\ 7y - y = 50 + 10 \\ 6y = 60 \\ y = \frac{60}{6} \\ y = 10$