"Y" is changed to "I" when making some words plural. In this case, the "y" is changed to "I" and then "es" is also added. An example would be the word "money" in which the "y" is changed to "i" and "es" is added to make "monies."
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If a variable goes from X to Y, change = Y-X.The absolute change = Y-X or X-Y, whichever is positive.The percentage change = 100*Change/X = 100*(Y-X)/X or 100*(Y/X - 1)
the change in y over the change in x equals the slope(m) in the equation y=mx+b
yes, change in y over change in x equals slope
Some words end in a consonant + y. To make them plural, change y to i and add es. Candy -> Candies
The slope of a function is the y-intercept or the change in y, over the change in x.