Question

Não estou dando conta desses exercicios.

Porfavor me ajudem.

Answer 1

8.
a) x=21,
$\frac{21}{3} = 7$
b) x= -12,
$\frac{ 2 \times 10}{4} = - 3$
c)x=10,
$\frac{2 \times 10}{5} = 4$
d)x= -15,
$\frac{2 \times ( - 15)}{3} = - 10$
e)x=40,
$\frac{3 \times 40}{4} = 30$
f)x= -45,
$\frac{2 \times ( - 45)}{5} = - 18$

Answer 2

8-
A)x/3=7 ==> x=7.3 ==> x=21

B)x/4=-3 ==> x=-3.4 ==> x=-12

C)2x/5=4 ==> 2x=5.4 ==> 2x=10 ==> x=5

D)2x/3=-10 ==> 2x=-10.3 ==> 2x=-30 ==> 2=-30/2 =>x=-15

E)3x/4=30 ==> 3x=30.4 ==> 3x=120 ==> x=40

F)2x/5=-18 ==> 2x=-18.5 ==> 2x=-90 ==> x=-45

9-
A)-x=9 // x=-9

B)-x=-2 /// x=2

C)-7x=14 /// x=-2

D)-3x=10 /// x=-10/3

E)-5x=-12 /// x=12/5

F)-4x=8 /// x=-2

G)-3x=-9 /// x=3

H)-5x=15 /// x=-3

I)-2x=-10 /// x=5

J)15=-3x /// x=-5

K)-40=-5x /// x=8