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[tex]1)\ \left \{ {{3x+y=5} \atop {2x+y=7}} \right. \\\\\\\left \{ {{3x+y(-1)=5(-1)} \atop {2x+y=7}} \right. \\\\\\\left \{ {{-3x-y=(-5)} \atop {2x+y=7}} \right. \\\\\\2x+y+(-3x-y)=7+(-5)\\\\2x+y-3x-y=7-5\\\\2x-3x=2\\\\-x=2\\\\-(-x)=[-(2)]\\\\\bold{x=(-2)}[/tex]

[tex]\left \{ {{3x+y=5} \atop {2x+y=7}} \right. \\\\\\\left \{ {{(-2)(3x+y)=(-2)(5)} \atop {3(2x+y)=3(7)}} \right. \\\\\\\left \{ {{-6x-2y=(-10)} \atop {6x+3y=21}} \right. \\\\6x+3y+(-6x-2y)=21+(-10)\\\\6x+3y-6x-2y=21-10\\\\3y-2y=11\\\\\bold{y=11}[/tex]

[tex]2)\ \left \{ {{2x+y=5} \atop {x-3y=6}} \right. \\\\\\\left \{ {{3(2x+y)=3(5)} \atop {x-3y=6}} \right. \\\\\\\left \{ {{6x+3y=15} \atop {x-3y=6}} \right. \\\\6x+3y+x-3y=15+6\\\\6x+x=21\\\\7x=21\\\\\frac{7x}{7} =\frac{21}{7} \\\\\bold{x=3}[/tex]

[tex]\left \{ {{2x+y=5} \atop {x-3y=6}} \right. \\\\\\\left \{ {{2x+y=5} \atop {(-2)(x-3y)=(-2)(6)}} \right. \\\\\\\left \{ {{2x+y=5} \atop {-2x+6y=(-12)}} \right. \\\\\\2x+y+(-2x+6y)=5+(-12)\\\\2x+y-2x+6y=5-12\\\\y+6y=(-7)\\\\7y=(-7)\\\\\frac{7y}{7} =\frac{-7}{7} \\\\\bold{y=(-1)}[/tex]

Resposta:

bem provável que chegaremos a 36

1°) X =

[tex] \frac{7}{17} [/tex]

2°) x = 3

3°) x =

[tex] \frac{8}{19} [/tex]

Explicação passo-a-passo:

1°)

5(x-1) = 3 (4 - x) + x

remova os parênteses

5x -5 = 12 -3x + x

mova os termos

5x +3x - x = 12 + 5

coloque os termos similares em evidência e some os demais

7x = 17

x =

[tex] \frac{7}{17} [/tex]

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2°)

x + 2(x-1) + 3(2x + 1) = 19

remova os parênteses

x +2x -2 +6x +3 = 19

mova os termos

x +2x +6x = 19 -3 +2

calcule

9x = 18

x = 18 ÷ 9

x = 2

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3°)

9x - 2 (1 - 3x) = 2 - 4 (x - 1)

remova os parênteses

9x -2 +6x = 2 -4x +4

mova os termos

9x +6x +4x = 2 +4 +2

19x = 8

x =

[tex] \frac{8}{19} [/tex]

tomara que eu tenha tirado sua dúvida, se puder marcar como melhor resposta eu ficaria muito agradecido <3

Resposta:

resposta:+2x -1x

Explicação passo-a-passo:

eu acho que é isso