What are the coordinates of a point called
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Constant of proportionality is given by: y=kx oy
So lets suppose y = 50 and x = 5 so k will be
This 10 will remain constant. For every $50 Michael saves $5, for $100 he will save $10 , for $150 he will save $15 and so on.
So this 'k' will be same for each value of x and y.