diff --git a/equation_of_line.py b/equation_of_line.py
new file mode 100644
index 0000000..abd87ca
--- /dev/null
+++ b/equation_of_line.py
@@ -0,0 +1,20 @@
+def equation_of_line(values):
+    b = values[0]
+    k = values[1] - b
+    
+    if any(y != k * x + b for x, y in enumerate(values, 0)):
+        return
+    
+    res = ""
+    
+    if k:
+        res += f"{'-' if k == -1 else k != 1 and k or ''}x"
+    
+    if b:
+        res += (res and " ") + "+-"[b < 0] + str(abs(b))
+    return f"y = {res}"
+        
+
+
+v = [0, -1, -2, -3, -4]
+print(equation_of_line(v))
\ No newline at end of file
diff --git a/linalg1.py b/linalg1.py
new file mode 100644
index 0000000..945e579
--- /dev/null
+++ b/linalg1.py
@@ -0,0 +1,19 @@
+from math import sqrt
+
+
+def find_discr(a, b, c):
+    return b**2 - 4 * a * c
+
+
+def solve_sq(a, b, c):
+    d = find_discr(a, b, c)
+    if d < 0:
+         return
+    if d == 0:
+        return -b / (2 * a)
+    return tuple(
+        (-b + s * sqrt(d)) / (2 * a)
+        for s in [-1, 1]
+    )
+
+