Question

Por favor urgente!!se puder me ajudar agradeço bastante!!

Answer 1

oii! o exercicio 1) está aqui abaixo escrito. o exericicio 2) está nas fotos acima.

questao 1)

a) $21x - 17 = 109$

$21x = 109 + 17$

$21x = 126$

$x = \frac{126}{21}$

$x = 6$

S = { 6 }

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b)$73x + 100 = 53x$

$73x - 53x = - 100$

$20x = - 100$

$x = \frac{ - 100}{20}$

$x = - 5$

S = { - 5 }

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c)$1,7 + 2,5x = 4,2$

$2,5x = 4,2 - 1,7$

$2,5x = 2,5$

$x = \frac{2,5}{2,5 }$

$x = 1$

S = { 1 }

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d)$23x - 22 = 19x + 6$

$23x - 19x = 6 + 22$

$4x = 28$

$x = \frac{28}{4}$

$x = 7$

S = { 7 }

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e)$12x - 16 = - 21 + 10x$

$12x - 10x = - 21 + 16$

$2x = - 5$

$x = \frac{ - 5}{2}$

S = { - 5/2 }

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f)$1,9 - 3,6 = x - 10,8$

$- 1,7 = x - 10,8$

$- 1,7 + 10,8 = x$

$9,1 = x$

S = { 9,1 }

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g)$10(x + 1) - 5(x - 2) = 70$

$10x + 10 - 5x + 10 = 70$

$5x = 70 - 10 - 10$

$5x = 70 - 20$

$5x = 50$

$x = \frac{50}{5}$

$x = 10$

S = { 10 }

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h)$5(x + 2) - 13 = 2(3x - 1)$

$5x + 10 - 13 = 6x - 2$

$5x - 6x = - 2 + 13 - 10$

$- x = 1 \: \: \: \: \: \: . \: \:( - 1)$

$x = - 1$

S = { - 1 }

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i)$7(2 + x) = 5(x - 1,2) + 35$

$14 + 7x = 5x - 6 + 35$

$7x - 5x = 35 - 6 - 14$

$2x = 15$

$x = \frac{15}{2}$

vou dividir este... lembre que as fraçoes no fim voce pode dividir dai vai dar numeros com virgula.

$x = 7,5$

S = { 7, 5 }

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j)$3(x + 1) - 2(x - 1) = - (x + 5)$

$3x + 3 - 2x + 2 = - x - 5$

$3x - 2x + x = - 5 - 3 - 2$

$2x = - 10$

$x = \frac{ - 10}{2}$

$x = - 5$

S = { - 5 }

espero ter ajudado! lembre que a soluçao dos sistema da numero 2 que fiz nas fotos, os profes querem de jeitos diferentes... entao coloque como seu profe gosta e pede...

se precisas de explicaçao me diga nos comentaros que eu edito! fale rapido