Question

Resolva as equações:
1) 2x + x =9
2) 7+ 3y - y = 15
3) 4 + y = 5y + 12
4) Z + 3 = 2z + 1
5) 5y + 4 = 2y – 1
6) 7 = 3x - x + 2
7) -5 = y -3y
8) 3x - 9 = 9
9) 10x = 20 + 9x
10) 2x + 1 = 15

Answer 1

1) 3x=9
x=9/3
x=3

2) 2y=15-7
2y=8
y=8/2
y=4

3)y-5y=12-4
-4y=8 .(-1)
4y= -8
y= -8/4
y= -2

4) z- 2z= 1- 3
-z= -2 .(-1)
z=2

5)5y-2y= -1 -4
3y= -5
y= -5/3
y= -1,666...

6)2x=7-2
2x= 5
x= 5/2
x= 2,5

7) -5 = -2y
2y= 5
y= 5/2
y=2,5

8)3x= 9+9
3x= 18
x= 18/3
×=6

9)x=20

10) 2x=14
x=14/2
x=7