Question

equaçoes do 1° grau
a)5x-7=2x+1
b)
-3(x+5)=2x-1

Answer 1

a) 5x - 7 = 2x +1
5x -2x = 1+7
3x = 8
x = 8/3
b) -3(x+5) = 2x -1
-3x - 15= 2x --1
-3x - 2x = -1+15
-5x = +14(.-1)
5x= - 14
x = - 14/5

Answer 2

a) 5X-7=2X+1
5X -2X=1+7
3X=8
X=8/3 ou X=2,666...

8  I 3      
6    2,66
20
18
20
18
2

b)
-3(X+5)=2X-1
-3X-15=2X-1
-3X-2X=15-1
-5X=14
X= -14/5  ou X= -2,8