Here is an ACT math practice question on solutions of linear system of equations.

$$ x – 2y = 4 $$

$$ 2x + my = 8 $$

For what value of $m$ will the system of equations above have

an infinite number of solutions?

- $\quad -4$
- $\quad -2$
- $\quad 2$
- $\quad 4$
- $\quad 8$