630 red marbles
420 yellow marbles
210 purple marbles
because 1260 x 1/2 = 630, 1260 x 1/3 = 420, 1260 x 1/6 = 210
Y = 3
If you'd like an explaination, please, ask.
I just don't want to write all of the steps out -- yey, apathy.
4. Change the sign of the integer
