Question

Sistema lineares regra de cramer 3x-4y=1 x+3y=9

Answer 1

3x - 4y = 1
x + 3y = 9
==========

D

|3 -4|
|1.. 3|

9 + 4 = 13

Dx

|1. -4|
|9. 3|

3 + 9 = 12

|3. 1|
|1. 9|

27 - 1 = 26

X = Dx/D

x = 12/13

Y = Dy/D

y = 26/13
y = 2

s={ 12/13, 2 }