Question

1)Resolva as equaçoes do 1 Grau:
a| 5x-3=2x+84?
b| 5x+3.(x-5)=4x+63?
c| 2.(x+1)-3.(2x-5)=6x-73?
d|2.(x+1)-3.(2x-5)=6x-73?

Answer 1

5x - 3 = 2x + 84
5x - 2x = 84 + 3
3x = 87
x = 87/3 = 29 *****
b
5x + 3 ( x - 5) = 4x + 63
5x + 3x - 15 - 4x = 63
4x = 63 + 15
4x = 78
x = 78/4 = 39/2 ****

c
2 ( x + 1) - 3 ( 2x - 5) = 6x - 73
2x + 2 - 6x + 15 - 6x = -73
-10x = -73 - 2 - 15
-10x = -90
10x = 90
x = 90/10 = 9 ****

d
2( x + 1) - 3( 2x - 5) = 6x - 73 ( igual a c )

Answer 2

a)
5x - 3 = 2x + 84
5x - 2x = 84 + 3
3x = 87
x = 87/3 = 29

b)
5x + 3(x - 5) = 4x + 63
5x + 3x - 15 = 4x + 63
5x + 3x - 4x = 63 + 15
(:2) 4x = 78 (:2)
2x = 39
x = 39/2

c)
2(x + 1) - 3(2x - 5) = 6x - 73
2x + 2 - 6x + 15 = 6x - 73
2x - 6x - 6x = -73 - 2 - 15
2x -12x = -90
-10x = -90 (-1)
10x = 90
x = 9