Question

Choose the TWO equations that have infinitely many solutions.


3
x
+
x
=
4
x


3
(
x
+
1
)
=
3
x
+
2


2
(
x
+
2
)
=
x
+
4


2
(
x
+
1
)
=
2
x
+
1


3
(
x
+
1
)
=
3
x
+
3

Answer 1

The 1st and the 5th.

1) 3x + x = 4x → 4x = 4x (identity, all x work).
5) 3(x + 1) = 3x + 3 → 3x + 3 = 3x + 3 (identity, all x work).