Question

resolva as equações de primeiro grau a seguir
3 + x = 0
23 x + 2 = 2
12 - 7 + 4 x = 25
5 x - 3x = 30
4 x + 10 = 45 - 3x

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Answer 1

Explicação passo a passo:

Para resolver as equações de primeiro grau, sempre iguale a 0 e isole o X.

$a) 3+x = 0\\x = -3\\\\b)23x+2=2\\23x = 2-2\\23x = 0\\\\c)12-7+4x = 25\\5 +4x = 25\\4x = 25 - 5\\4x = 20\\x = \frac{20}{4} \\x = 5\\\\d) 5x - 3x = 30\\2x = 30\\\\x = \frac{30}{2}\\\\x = 15\\\\\\e)4x + 10 = 45 -3x\\ 4x+3x = 45 -10\\7x = 35\\\\x = \frac{35}{7} \\\\x=5$

Answer 2

A)

$3 + x = 0$

$\boxed{x = - 3}$

B)

$23x + 2 = 2$

$23x = 2 - 2$

$\boxed{23x = 0}$

C)

$12 - 7 + 4x = 25$

$5 + 4x = 25$

$4x = 25 - 5$

$4 x= 20$

$x = \frac{20}{4}$

$\boxed{ x = 5}$

D)

$5x - 3x = 30$

$2x = 30$

$x = \frac{30}{2}$

$\boxed{x = 15}$

E)

$4x + 10 = 45 - 3x$

$4x + 3x = 45 - 10$

$7x = 35$

$\boxed{x = 5}$

Espero ter ajudado!