Step-by-step explanation:
We are given the absolute value functions below;

Note that for this function, we have a v-shaped graph, since the values of the output is always positive (absolute value) and the vertex is at (0, 0). Also, if the value of a in the function;

is positive, the graph opens upwards, and if the value of a is negative;

then it opens downwards.
Therefore,
ANSWER;
![\begin{gathered} y=3|x|\text{ Opens upwards} \\ y=-(3)/(4)|x|\text{ Opens downwards} \\ y=-(1)/(2)|x|\text{ Opens downwards} \\ y=-1|x|\text{ Opens downwards} \end{gathered}]()

