Question

Resolva as equações :
A)-2y=18
B)y-12=15
C)7x+5=19
D)4 (x+3)=20
E)5(2x-1)=2 (x+4)
F)5x-7=2x+2
J)4y-6=2y

Answer 1

A) -2y = 18 
y = 18/-2 
y = -9

B) y - 12 = 15
y = 15 + 12 
y = 27

C) 7x + 5 = 19
7x = 19 - 5
7x = 14
x = 14/7
x = 2

D) 4.(x+3) = 20
4x + 12 = 20
4x = 20 -12
4x = 8
x = 8/4
x = 2

E) 5. (2x - 1) = 2.(x+4)
10x - 5 = 2x + 8
10x - 2x = 8 + 5
8x = 13
x = 13/8

F) 5x-7 = 2x+2
5x - 2x = 9
3x = 9
x = 9/3
x = 3

J) 4y - 6 = 2y 
4y - 2y = +6
2y = 6
y = 6/2
y = 3