Question

resolva as seguintes equaçoes:
a) 84=6x
b) x/3=7
c) x/4= -3
d) 2x-/5=4
e)2x/3=10
f) 3x/4=30

Answer 1

a)

$84=6x\\ \\ x=\frac{84}{6} \\ \\ x=14$

b)

$\frac{x}{3} =7\\ \\ x=7*3\\ \\ x=21$

c)

$\frac{x}{4}=-3\\ \\ x=-3*(4)\\ \\ x=-12$

d)

$\frac{2x}{5}=4\\ \\ 2x=4*5\\ \\ x=\frac{20}{2} \\ \\ x=10$

e)

$\frac{2x}{3}=10\\ \\ 2x=10*3\\ \\ x=\frac{30}{2} \\ \\ x=15$

f)

$\frac{3x}{4}=30\\ \\ 3x=30*4\\ \\ x=\frac{120}{3} \\ \\ x=40$

:)