Question

descubra o valor das incógnitas , por meio da equação do 1° grau.

A) x + 6 = 56

B) 4 a = 12

C) 12m - 3 = 5m + 11

D) 2 ( x + 3) = 16

E) -x + 4 = 10

F)²/³ = ⁶/x

G) 5x + 3 - 2x = x - 4 - 3

H) - 2y = -24​

Answer 1

Explicação passo-a-passo:

a) $\sf x+6=56$

$\sf x=56-6$

$\sf x=50$

b) $\sf 4a=12$

$\sf a=\dfrac{12}{4}$

$\sf a=3$

c) $\sf 12m-3=5m+11$

$\sf 12m-5m=11+3$

$\sf 7m=14$

$\sf m=\dfrac{14}{7}$

$\sf m=2$

d) $\sf 2\cdot(x+3)=16$

$\sf 2x+6=16$

$\sf 2x=16-6$

$\sf 2x=10$

$\sf x=\dfrac{10}{2}$

$\sf x=5$

e) $\sf -x+4=10$

$\sf -x+4=10~~~\cdot(-1)$

$\sf x-4=-10$

$\sf x=-10+4$

$\sf x=-6$

f) $\sf \dfrac{2}{3}=\dfrac{6}{x}$

$\sf 2x=3\cdot6$

$\sf 2x=18$

$\sf x=\dfrac{18}{2}$

$\sf x=9$

g) $\sf 5x+3-2x=x-4-3$

$\sf 3x+3=x-7$

$\sf 3x-x=-7-3$

$\sf 2x=-10$

$\sf x=\dfrac{-10}{2}$

$\sf x=-5$

h) $\sf -2y=-24$

$\sf y=\dfrac{-24}{-2}$

$\sf y=12$