diff --git a/9/exercise_9.txt b/9/exercise_9.txt
new file mode 100644
index 0000000..0081487
--- /dev/null
+++ b/9/exercise_9.txt
@@ -0,0 +1,6 @@
+var('x y')
+plot(x^2-2*x+3,-10,10)
+plot(cos(2*x),-10,10)
+plot(sin(1/x),-10,10)
+plot3d(x^2+y^2,(x,-1,1),(y,-1,1))
+plot3d(x^2-y^2+2*x*y^2+1,(x,-1,1),(y,-1,1))
\ No newline at end of file