Question

ATIVIDADES:
1) Resolva a equações do primeiro grau abaixo:
a) 2X + 4 = 10
b) 5X – 2 = 2X + 16
c) 6X – 10 = 2X + 14
d) 3(X + 2) = 15

Answer 1

Olá!

$\\ { \large \displaystyle \sf {a) \: 2x + 4 = 10 }}$

${ \large \displaystyle \sf {2x = 10 - 4 }}$

${ \large \displaystyle \sf {2x =6 }}$

${ \large \displaystyle \sf {x = \frac{6}{2} }}$

$\boxed{ \boxed{ \blue{ { \large \displaystyle \sf {x = 3 }}}}}$

${ \large \displaystyle \sf {b) \: 5x - 2 = 2x + 16 }}$

${ \large \displaystyle \sf { 5x - 2x = 16 + 2 }}$

${ \large \displaystyle \sf { 3x = 18 }}$

${ \large \displaystyle \sf {x = \frac{18}{3} }}$

$\boxed{ \boxed{ \blue{ { \large \displaystyle \sf {x = 6 }}}}}$

${ \large \displaystyle \sf {c) \: 6x - 10 = 2x + 14 }}$

${ \large \displaystyle \sf {6x - 2x = 14 + 10 }}$

${ \large \displaystyle \sf {4x = 24 }}$

${ \large \displaystyle \sf {x = \frac{24}{4} }}$

$\boxed{ \boxed{ \blue{ { \large \displaystyle \sf {x = 6 }}}}}$

${ \large \displaystyle \sf {d) \: 3(x + 2) = 15}}$

${ \large \displaystyle \sf {3x + 6 = 15}}$

${ \large \displaystyle \sf {3x = 15 - 6}}$

${ \large \displaystyle \sf {3x = 9}}$

${ \large \displaystyle \sf {x = \frac{9}{3} }}$

$\boxed{ \boxed{ \blue{ { \large \displaystyle \sf {x = 3 }}}}}$