Question

Me ajudem ae por favor

Answer 1

a)

9x + 17 = 8x + 7

9x - 8x = 7 - 17

x = -10

b)

-2x - 7 = 4 + 3

-2x = 7 + 7

-2x = 14

x = 14/-2

x = -7

c)

2x + 5 = -6x + 13

2x + 6x = 13 - 5

8x = 8

x = 8/8

x = 1

d)

3y - 15 + 7y = 15 - 5y

3y + 5y + 7y = 15 + 15

15y = 30

y = 30/15

y = 2

e)

2a - 6 = -5a - 20

2a + + 5a = -20 + 6

7a = -14

a = -14/7

a = -2

Answer 2

$a)9x + 17 = 8x + 7 \\ 9x - 8x = 7 - 17 \\ x = - 10$
$b) - 2x - 7 = 4 + 3 \\ - 2x = 4 + 3 + 7 \\ - 2x = 14 \: ( \times ( - 1) \: ) \\ x = \frac{ - 14}{2} \\ x = - 7$
$c)2x + 5 = - 6x + 13 \\ 2x + 6x = 13 - 5 \\ 8x = 8 \\ x = \frac{8}{8} \\ x = 1$
$d)3y - 15 + 7y = 15 - 5y \\ 3y + 7y + 5y = 15 + 15 \\ 15y = 30 \\ y = \frac{30}{15} \\ y = 2$
$e)2a - 6 = - 5a - 20 \\ 2a + 5a = - 20 + 6 \\ 7a = - 14 \\ a = \frac{ - 14}{7} \\ a = - 2$