5x
+
3y
-
2x
+
5y
-
4y
=
____________________
+
____________________
8x
+
2x
-
5x
+
10y
-
6y
=
____________________
+
____________________
10x
-
3y
-
3x
-
5y
=
____________________
-
____________________
15x
+
2x
-
12x
-
2y
=
____________________
-
____________________
8x
+
3x
-
7x
+
8y
-
2y
=
____________________
+
____________________
10x
-
2y
+
2x
+
5y
-
4x
=
____________________
+
____________________
