Question

Resolva as equaçoes:
a)3x-1 sobre 5=4
b)x+9 sobre 9=1
c)4x+3 sobre 5=-1
d)8x-5 sobre 2=9

Answer 1

A) 3X-1/5=4.....3X-1=20....3X=21...X=21/3=7
B)X+9/9=1.....X+9=9....X=0
C)4X+3=-5.....4X=-8....X=-4
D) 8X-5==18....8X=23....X=23/8

Answer 2

a)
$\frac{3x-1}{5} =4$

$3x-1=20$

$3x=21$

$x=21\div3$

x=7
S={7}

b)

$\frac{x+9}{9} =1$

$x+9=9$

$x=9-9$

x=0

S={0}

c)

$\frac{4x+3}{5} =-1$

$4x+3=-5$

$4x=-5-3$

$4x=-8$

$x=-8\div4$

x=-2

S={-2}

d)

$\frac{8x-5}{2} =9$

$8x-5=18$

$8x=18+5$

$8x=23$

$x= \frac{23}{8}$

S={ $\frac{23}{8}$}