Question

Sistema de Equação do 1 Grau 3x+2y=3 X-Y=4

Answer 1

$\begin{cases}\mathsf{3x+2y=3}\\\mathsf{x-y=4}\end{cases}$

$+\underline{\begin{cases}\mathsf{3x+2y=3}\\\mathsf{2x-2y=8}\end{cases}}$

$\mathsf{5x=11}\\\large\boxed{\boxed{\boxed{\boxed{\mathsf{x=\dfrac{11}{5}}}}}}$

$\mathsf{x-y=4\to~y=x-4}\\\mathsf{y=\dfrac{11}{5}-4=\dfrac{11-20}{5}}\\\large\boxed{\boxed{\boxed{\boxed{\mathsf{y=-\dfrac{9}{5}}}}}}$

$\huge\boxed{\boxed{\boxed{\boxed{\mathsf{s=\{\dfrac{11}{5},-\dfrac{9}{5}\}}}}}}$

Answer 2

Oie, Td Bom?!

{3x + 2y = 3

{x - y = 4

{3x + 2y = 3

{x = 4 + y

• Substitua o valor dado de x na equação 3x + 2y = 3.

3(4 + y) + 2y = 3

12 + 3y + 2y = 3

12 + 5y = 3

5y = 3 - 12

5y = - 9

y = - 9/5

• Substitua o valor dado de y na equação x = 4 + y.

x = 4 - 9/5

x = [20 - 9]/5

x = 11/5

S = {(x , y) = (11/5 , - 9/5)}

Att. Makaveli1996