Question

Resolva as equações do 1 grau: a)3y-8=13
b)12x-10=5x+11
c)7x+5=68-2x
d)14-3x=2x+29
e)8x-13=2x+11
f)10-4x=9-2x
g)3.(x-1)=6
h)5.(y-3)=2y+3
i)2x/3=-30
j)x/2+3/4=20
k)x/2=3/5
l)x/2-x/3=1
m)y/2=4/5
n)3x/5=10/3

Answer 1

A) 3y = 13 + 8 =
3y= 21
y = 21/3
y = 7

B) 12x - 5x = 11+ 10
7x= 12 + 10
7x= 21
x = 21/7
x= 3
C) 7x + 2x = 68 - 5
9x = 63
x = 63/9
x = 7
D) - 3x - 2x = 29 - 14
- x = 15 ( - 1)
x = - 15
E) 8x - 2x = 11 + 13
6x = 24
x = 24/6
x= 4
F) - 4x + 2x = 9 - 10
- 2x = - 1 ( - 1 )
2x = 1
x = 1/2
G) 3x - 3 = 6
3x = 6 + 3
3x = 9
x = 9/3
x = 3
H) 5y + 15 = 2y + 3
5y - 2y = 3 -15
3y = - 12
y = - 12/3
y= - 4
I) 2x/3 = -30
2x= - 90
x = 90/2
x = 45
J) x/2 + 3/4 = 20
x/4 + 3/4 = 20/4
2x + 3 = 80
2x = 80 - 3
2x = 77
x = 77/2
K) x/ 2 = 3/5
x/10 = 3/10
5x = 6
x= 6/5
L) x/2 - x/3 = 1
3x - 2x = 6
x = 6
M) y/2 = 4/5
5y = 8
y = 8/5
N) 3x/5 = 10/3
9x = 50
x= 50/9