diff --git a/RESUL.txt b/RESUL.txt
index bc4950e..ad94420 100644
--- a/RESUL.txt
+++ b/RESUL.txt
@@ -1,6 +1,3 @@
-   5.00000000      -4.00000000       1.00000000       0.00000000    
-  -4.00000000       6.00000000      -4.00000000       1.00000000    
-   1.00000000      -4.00000000       6.00000000      -4.00000000    
-   0.00000000       1.00000000      -4.00000000       5.00000000    
-   5.79999876       10.1999979       10.7999983       7.19999886    
-   0.00000000    
+   1.00000000       2.00000000       3.00000000       4.00000000    
+   1.00000000       2.50000000       3.50000000       4.30000019    
+  0.100000381       1.09000015    
diff --git a/lista2.f90 b/lista2.f90
index 84346e5..8164816 100644
--- a/lista2.f90
+++ b/lista2.f90
@@ -1,7 +1,7 @@
 include 'methods.f90'
 
 program lista2
-    integer n, i, j
+    integer n, m, i, j
     real, allocatable, dimension(:) :: b, x
     real, allocatable, dimension(:,:) :: a, d, c
     real lambda
diff --git a/lista3 b/lista3
new file mode 100755
index 0000000..bdfdd20
Binary files /dev/null and b/lista3 differ
diff --git a/lista3.f90 b/lista3.f90
new file mode 100644
index 0000000..7cf2e37
--- /dev/null
+++ b/lista3.f90
@@ -0,0 +1,28 @@
+include 'methods.f90'
+
+program lista3
+    integer n, i, j
+    real, allocatable, dimension(:) :: b, x, y
+    real, allocatable, dimension(:,:) :: a, d, c
+    real lambda
+
+    ! abertura do arquivo sistema.txt e leitura
+    open (1, file='sistemaM.txt', status='old', action='read')
+    read(1,*) n
+    allocate(x(n))
+    read(1,*) ( x(j) , j= 1 , n)
+
+    allocate(y(n))
+    read(1,*) ( y(i) , i= 1 , n)
+    close(1)
+
+    allocate(b(2))
+    call minimosQuadrados(b, x, y, n)
+
+    open(2, file='RESUL.txt', status='replace')
+    write(2,*) (x(j), j=1, n)
+    write(2, *) (y(i), i=1, n)
+    write(2, *) (b(i), i=1, 2)
+    close(2)
+
+end program lista3
\ No newline at end of file
diff --git a/methods.f90 b/methods.f90
index f9b9695..1f7d02d 100644
--- a/methods.f90
+++ b/methods.f90
@@ -450,7 +450,7 @@ subroutine powerMethod(a, x, n, tol, lambda)
 
 
 subroutine jocobi(a, x, n, tol, lambda)
-    integer :: n, i, j, k, tol, vi, vj
+    integer :: n, i, j, k, vi, vj
     real :: a(n,n), tol, x(n,n), lambda(n,n), maior
 
     x = 0.0
@@ -464,13 +464,68 @@ subroutine jocobi(a, x, n, tol, lambda)
         maior = 0.0
         do i=1, n
             do j=(i+1), n
-                if (abs(a(i,j)) >= maior)
+                if (abs(a(i,j)) >= maior) then
                     maior = abs(a(i,j))
                     vi = i
                     vj = j
+                end if
             end do
         end do
         ! FALTA 2.2, 3 e 4 do slide do professor
         ! PREGUICA DE PENSAR NO ALGORITMO DE 2.2
     end do
 end subroutine
+
+subroutine minimosQuadrados(b, x, y, n)
+    integer n, i, j
+    real b(2), x(n), y(n), a(2,2), soma, c(2), aI(2,2), det
+
+    b = 0.0
+    soma = 0.0
+
+    do i=1, n
+        soma = soma + 1
+    end do
+    a(1,1) = soma
+
+    soma = 0.0
+    do i=1, n
+        soma = soma + x(i)
+    end do
+    a(2,1) = soma
+    a(1,2) = soma
+
+    soma = 0.0
+    do i=1, n
+        soma = soma + (x(i))**2
+    end do
+    a(2,2) = soma
+
+    soma = 0.0
+    do i=1, n
+        soma = soma + y(i)
+    end do
+    c(1) = soma
+
+    soma = 0.0
+    do i=1, n
+        soma = soma + x(i)*y(i)
+    end do
+    c(2) = soma
+
+    det = a(1,1)*a(2,2) - (a(1,2)*a(2,1))
+    if (det == 0) then
+        STOP
+    end if
+    aI(1,1) = a(2,2)/det
+    aI(1,2) = -a(1,2)/det
+    aI(2,1) = -a(2,1)/det
+    aI(2,2) = a(1,1)/det
+
+    call multiplicaVetorMatriz(aI, c, b, 2)
+    write(*,*) a
+    write(*,*) c
+    write(*,*) b
+
+
+end subroutine
\ No newline at end of file
diff --git a/sistemaM.txt b/sistemaM.txt
new file mode 100644
index 0000000..cf0d4c4
--- /dev/null
+++ b/sistemaM.txt
@@ -0,0 +1,3 @@
+4
+1 2 3 4
+1 2.5 3.5 4.3
\ No newline at end of file