The ornamental design for a combinedcup and strawholder, as shown and described.
FIG. 1 is a bottom plan view of a combined cup and straw holder showing my new design.
FIG. 2 is a top plan view thereof.
FIG. 3 is a top perspective view thereof.
FIG. 4 is a bottom perspective view thereof.
FIG. 5 is a side view thereof.
FIG. 6 is a side view thereof with the broken lines of the cups, straws and lids are for illustrative purposes only and form no part of the claimed design; and,