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September 29th, 2015, 01:04 AM  #1 
Newbie Joined: Sep 2015 From: US Posts: 2 Thanks: 0  Rate of change to determine missing values in table
How I find the missing values in the table below? I'm confused on this. I know the formula for rate of change is y2y1/x2x1 but I don't get it. Please explain The constant rate of change is 3.1. x y 4.5 (blank) 1.3 2.17 6 (blank) (blank) 21.39 Thank you 
September 29th, 2015, 02:44 AM  #2 
Math Team Joined: Nov 2014 From: Australia Posts: 689 Thanks: 244 
Do you know the pointslope formula for a line? If a line has gradient (or rate of change) $m$ and passes through the point $(x_0,\,y_0)$, then it's equation is $y = m(x  x_0) + y_0$. In your case you have $m = 3.1$. Also, look at the third row. It's got an $x$ and $y$ value. That's your point $(x_0, y_0)$. After you have your equation, you can use it to fill the blanks. 

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