Question

resolva as equações:

15a=3

4× +12 =6

7x +13 =9

3x +9 =5x +3

-2x +3 =12 +3x​

Answer 1

$a)15a = 3 \\ a = \frac{3}{15} \: (divide \: tudo \: por \: 3) \\ a = \frac{1}{5} \\ b)4x + 12 = 6 \\ 4x = 6 - 12 \\ 4x = - 6 \\ x = - \frac{6}{4} (divide \: tudo \: por \: 2) = -3/2\\c)7x + 13 = 9 \\ 7x = 9 - 13 \\ 7x = - 4 \\ x = - \frac{4}{7} \\ d)3x + 9 = 5x + 3 \\ 3x - 5x = 3 - 9 \\ - 2x = - 6 \\ x = \frac{ - 6}{ - 2} \\ x = 3 \\ e) - 2x + 3 = 12 + 3x \\ - 2x - 3x = 12 - 3 \\ - 5x = 9 \\ x = - \frac{9}{5}$

Answer 2

Olá

a)15a=3

----a=3

-------___

-------15

a=5

b)4x+12=6

----4x=6-12

-----4x=-6

-----x=-6

--------___

---------4

x=-1,5

c)7x+13=9

---7x=9-13

---7x=-4

-----x=-4

--------___

----------7

x=-0,57142857142

d)3x+9=5x+3

---3x-5x=+3-9

__-2x=-6

-----x=-6

--------___

---------2

------x=-3

e)-2x+3=12+3x

__-2x-3x=12-3

-----+5x=9

--------x=9

----------___

--------__-5

x= -1,8

Espero ter te ajudado e bons estudos.

^_^