Question

determine a raiz de cada equação (1° grau) a seguir (resolva descobrindo o valor do termo X desconhecido), considerado
U = R:
A) 2x = -278
B) 7x = 196
C) 3x+2 = 2x -11
D) fração na foto
E) 2x/9 = 12
F) 8t + 18 = 6t + 10

(coloca a explicação tb se puder pf)

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Answer 1

a)

$2x = - 278 \\ x = - \frac{278}{2} \\ x = - 139$

b)

$7x = 196 \\ x = \frac{196}{7} \\ x = 28$

c)

$3x + 2 = 2x - 11 \\ 3x - 2x = - 11 - 2 \\ x = - 13$

d)

$\frac{3x}{7} = - 9 \\ 3x = - 63 \\ x = - \frac{63}{3} \\ x = - 21$

e)

$\frac{2x}{9} = 12 \\ 2x = 108 \\ x = \frac{108}{2} \\ x = 54$

f)

$8t + 18 = 6t + 10 \\ 8t - 6t = 10 - 18 \\ 2t = - 8 \\ t = - \frac{8}{2} \\ t = - 4$

Answer 2

$A)2x=-278\\x=\frac{-278}{2} =-139\\\\B)7x=196\\x=\frac{196}{7}=28\\\\C)3x+2=2x-11\\3x-2x=-11-2\\x=-13\\\\D)\frac{3x}{7} =-9\\3x=-9*7=-63\\x=\frac{-63}{3}=-21\\\\E)\frac{2x}{9}=12\\2x=12*9=108\\x=\frac{108}{2} =54\\\\F)8t+18=6t+10\\8t-6y=10-18\\2t=-8\\t=\frac{-8}{2} =-4$