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That means the y intercept is 0
put in 0 for x and you get 0 for y
so it goes through the origin 0,0
put in a multiple of 4 for x so that it is easy to divide
4 or 8 come to mind
but you only need one more
since you have the origin .
You only need two points for a straight line
so when x=4 y=5
when x=8 y=10