Question

Resolva as equações
a: 3 (x3)=30
b: 3 (y-1) - 4 (y-2)=6

Answer 1

2(x 2)=30
2 x 4 = 30
2 x = -4 +30
2 x = 26
x = 26/2
x = 13

3 (y -1) -4 (y -2)=6
3 y -3 -4 y 8 = 6
3 y -4 y = -8 +3 + 6
- 1 y = 1
y = 1 / -1
y = -1

Answer 2

a) 3x= 30-3
3x= 27
x= 9

b) 3y-3-4y+8=6
3y-4y=6+3
-y= 9
y= -9