Question 194899
Let's start off with some simple cases:


Case 1: If we have only one y, then we'll simply have {{{y=1y}}}



Case 2: If we add up two y's, then {{{y+y=2y}}}



Case 3: If we add up three y's, then {{{y+y+y=3y}}}



Case 4: If we add up four y's, then {{{y+y+y+y=4y}}}



etc...



So all we're doing is placing the number of y's that we're adding in front of the y's.



So if we add up 5 y's, then we'll get {{{5y}}}



If we add up 22 y's, then we'll get {{{22y}}}. 



So if we add up "x" y's, then we'll get {{{xy}}} which is the answer.



Note: the reason why this works is because multiplication is really a shortcut for repeated addition.