diff --git a/apps/regression/model/affine_model.cpp b/apps/regression/model/affine_model.cpp
index 0786bafe5..fc18ac3aa 100644
--- a/apps/regression/model/affine_model.cpp
+++ b/apps/regression/model/affine_model.cpp
@@ -1,4 +1,4 @@
-#include "affine_model.h"
+#include "linear_model.h"
 #include "../store.h"
 #include <poincare/layout_helper.h>
 #include <math.h>
@@ -10,7 +10,7 @@ namespace Regression {
 
 Layout AffineModel::layout() {
   if (m_layout.isUninitialized()) {
-    const char * s = "a·X";
+    const char * s = "a·X+b";
     m_layout = LayoutHelper::String(s, strlen(s), k_layoutFont);
   }
   return m_layout;
@@ -18,7 +18,8 @@ Layout AffineModel::layout() {
 
 double AffineModel::evaluate(double * modelCoefficients, double x) const {
   double a = modelCoefficients[0];
-  return a*x;
+  double b = modelCoefficients[1];
+  return a*x+b;
 }
 
 double AffineModel::levelSet(double * modelCoefficients, double xMin, double step, double xMax, double y, Poincare::Context * context) {
@@ -27,7 +28,7 @@ double AffineModel::levelSet(double * modelCoefficients, double xMin, double ste
   if (a == 0) {
     return NAN;
   }
-  return y-b;
+  return (y-b)/a;
 }
 
 void AffineModel::fit(Store * store, int series, double * modelCoefficients, Poincare::Context * context) {
diff --git a/apps/regression/model/affine_model.h b/apps/regression/model/affine_model.h
index 42dbf7a7e..b2c0a7cd0 100644
--- a/apps/regression/model/affine_model.h
+++ b/apps/regression/model/affine_model.h
@@ -1,5 +1,5 @@
-#ifndef REGRESSION_AFFINE_MODEL_H
-#define REGRESSION_AFFINE_MODEL_H
+#ifndef REGRESSION_LINEAR_MODEL_H
+#define REGRESSION_LINEAR_MODEL_H
 
 #include "model.h"
 
@@ -14,8 +14,8 @@ public:
   double levelSet(double * modelCoefficients, double xMin, double step, double xMax, double y, Poincare::Context * context) override;
   void fit(Store * store, int series, double * modelCoefficients, Poincare::Context * context) override;
   double partialDerivate(double * modelCoefficients, int derivateCoefficientIndex, double x) const override;
-  int numberOfCoefficients() const override { return 1; }
-  int bannerLinesCount() const override { return 2; }
+  int numberOfCoefficients() const override { return 2; }
+  int bannerLinesCount() const override { return 3; }
 };
 
 }
diff --git a/apps/regression/model/linear_model.cpp b/apps/regression/model/linear_model.cpp
index 3de85628f..824500e09 100644
--- a/apps/regression/model/linear_model.cpp
+++ b/apps/regression/model/linear_model.cpp
@@ -1,4 +1,4 @@
-#include "linear_model.h"
+#include "affine_model.h"
 #include "../store.h"
 #include <poincare/layout_helper.h>
 #include <math.h>
@@ -10,7 +10,7 @@ namespace Regression {
 
 Layout LinearModel::layout() {
   if (m_layout.isUninitialized()) {
-    const char * s = "a·X+b";
+    const char * s = "a·X";
     m_layout = LayoutHelper::String(s, strlen(s), k_layoutFont);
   }
   return m_layout;
@@ -18,8 +18,7 @@ Layout LinearModel::layout() {
 
 double LinearModel::evaluate(double * modelCoefficients, double x) const {
   double a = modelCoefficients[0];
-  double b = modelCoefficients[1];
-  return a*x+b;
+  return a*x;
 }
 
 double LinearModel::levelSet(double * modelCoefficients, double xMin, double step, double xMax, double y, Poincare::Context * context) {
@@ -28,7 +27,7 @@ double LinearModel::levelSet(double * modelCoefficients, double xMin, double ste
   if (a == 0) {
     return NAN;
   }
-  return (y-b)/a;
+  return y-b;
 }
 
 void LinearModel::fit(Store * store, int series, double * modelCoefficients, Poincare::Context * context) {
diff --git a/apps/regression/model/linear_model.h b/apps/regression/model/linear_model.h
index 4fd9d2988..4fb6fd886 100644
--- a/apps/regression/model/linear_model.h
+++ b/apps/regression/model/linear_model.h
@@ -1,5 +1,5 @@
-#ifndef REGRESSION_LINEAR_MODEL_H
-#define REGRESSION_LINEAR_MODEL_H
+#ifndef REGRESSION_AFFINE_MODEL_H
+#define REGRESSION_AFFINE_MODEL_H
 
 #include "model.h"
 
@@ -14,8 +14,8 @@ public:
   double levelSet(double * modelCoefficients, double xMin, double step, double xMax, double y, Poincare::Context * context) override;
   void fit(Store * store, int series, double * modelCoefficients, Poincare::Context * context) override;
   double partialDerivate(double * modelCoefficients, int derivateCoefficientIndex, double x) const override;
-  int numberOfCoefficients() const override { return 2; }
-  int bannerLinesCount() const override { return 3; }
+  int numberOfCoefficients() const override { return 1; }
+  int bannerLinesCount() const override { return 2; }
 };
 
 }
diff --git a/apps/regression/store.cpp b/apps/regression/store.cpp
index 7a98b4f96..f1ac3dd9a 100644
--- a/apps/regression/store.cpp
+++ b/apps/regression/store.cpp
@@ -285,7 +285,7 @@ double Store::squaredCorrelationCoefficient(int series) const {
 }
 
 Model * Store::regressionModel(int index) {
-  Model * models[Model::k_numberOfModels] = {&m_linearModel, &m_affineModel, &m_quadraticModel, &m_cubicModel, &m_quarticModel, &m_logarithmicModel, &m_exponentialModel, &m_powerModel, &m_trigonometricModel, &m_logisticModel};
+  Model * models[Model::k_numberOfModels] = {&m_affineModel, &m_linearModel, &m_quadraticModel, &m_cubicModel, &m_quarticModel, &m_logarithmicModel, &m_exponentialModel, &m_powerModel, &m_trigonometricModel, &m_logisticModel};
   return models[index];
 }