Question

Resolva o sistema usando a regra de Cramer
A){4x+y=21
{3x-2y=2

B){6x-2y=8
{3x+2y=1


Me ajudem por favor!!!!!

Answer 1

A)

{4x + y = 21
{3x - 2y = 2
===========

| 4.. 1|
| 3 -2|

D = -8 - 3
D = -11


| 21 1 |
| 2 -2|

Dx = -42 - 2
Dx = -44


| 4 21|
| 3 ..2|

Dy = 8 - 63
Dy = -55



X = Dx/D
Y = Dy/D



X = -44/-11
X = 4

Y = -55/-11
Y = 5


S={ 4, 5 }

=======================

B)

{6x - 2y = 8
{3x + 2y = 1



| 6 -2|
| 3. 2|

D = 12 + 6
D = 18


| 8 -2|
| 1.. 2|


Dx = 16 + 2
Dx = 18


| 6 8|
| 3 1|


Dy = 6 - 24
Dy = -18



X = 18/18
X = 1

Y = -18/18
Y = -1


S={ 1, -1 }