Question

Equaçao 1º grau
a) 4 -x = 7
b) 4x - 2 = 5
d) 2x + 5x = 21
e) 7x + 2x - 8 = -26

Answer 1

a) 4 -x = 7
-x=7-4
-x=3 ×(-1)
X=-3

b) 4x - 2 = 5
4x=5+2
4x=7
X=7/4
X=1,75

d) 2x + 5x = 21
7x=21
X=21/7
X=3

e) 7x + 2x - 8 = -26
9x=-26+8
9x=-18
X=-18/9
X=-2

Espero ter ajudado :-)

Answer 2

Olá, bom dia ☺

Resoluções:

a)

4-x=7
-x=7-4
-x=3
x=-3

b)


4x - 2 = 5
4x=5+2
4x=7
x=7/4

c)

2x + 5x = 21
7x=21
x=21/7
x=3

d)


7x + 2x - 8 = -26
9x-8=-26
9x=-26+8
9x=-18
x=-18/9
x=-2

Bons estudos :)