Question

Calcule o valor da incógnita

a) 12X-89=X-23

B)4a-5=+15

c)7y=49

Answer 1

$\Large\displaystyle\begin{gathered} \sf{12x-89=x-23 } \end{gathered}$

$\Large\displaystyle\begin{gathered} \sf{12x-x=-23+89 } \end{gathered}$

$\Large\displaystyle\begin{gathered} \sf{ 11x=66} \end{gathered}$

$\Large\displaystyle\text{ \begin{gathered} \sf{ x=\frac{66}{11}} \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \boxed{\boxed{\sf{x=6}} } \end{gathered} }$

$\Large\displaystyle\begin{gathered} \sf{ 4a-5=15} \end{gathered}$

$\Large\displaystyle\begin{gathered} \sf{4a=15+5 } \end{gathered}$

$\Large\displaystyle\begin{gathered} \sf{ 4a=20} \end{gathered}$

$\Large\displaystyle\text{ \begin{gathered} \sf{ a=\frac{20}{4}} \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \boxed{\boxed{\sf{a=5 } }}\end{gathered} }$

$\Large\displaystyle\begin{gathered} \sf{7y=49 } \end{gathered}$

$\Large\displaystyle\text{ \begin{gathered} \sf{y=\frac{49}{7} } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \boxed{\boxed{\sf{y=7 }}} \end{gathered} }$

Answer 2

Resposta:

a) 12x-89=x-23

12x-x =89-23

11x = 66

x=66/11=6

B)4a-5=+15

4a=5+15

4a =20

a=20/4=5

c)7y=49

y=49/7

y=7