Question

5. Resolva as equações a seguir.
a) x + 15 = 30
b) 2x + 10 = 30
c) 28 - x = 40 - 2x
d) 4x - 7 = 2x - 8​

Answer 1

a) $x+15=30$

$x=30-15$

$x=15$

b) $2x+10=30$

$2x=30-10$

$2x=20$

$x=\frac{20}{2}$

$x=10$

c) $28-x=40-2x$

$-x+2x=40-28$

$x=12$

d) $4x-7=2x-8$

$4x-2x=-8+7$

$2x=-1$

$x=-\frac{1}{2}$

Answer 2

Olá, bom dia ☺

Resoluções:

a)

x + 15 = 30

x = 30 - 15

x= 15

b)

2x + 10 = 30

2x = 30 - 10

2x = 20

x=20/2

x=10

c)

28 - x = 40 - 2x

-x + 2x = 40 - 28

x = 12

d)

4x - 7 = 2x - 8​

4x - 2x = -8 + 7

2x = -1

x=-1/2

Bons Estudos :)