Question 1134613
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If you are solving the problem using formal algebra, definitely don't use 2010 and 2012 as the x values of the two data points; it just means you are going to be using MUCH larger numbers in your calculations.  And in some similar problems it greatly reduces the accuracy of your answer.<br>
Instead, use 2010 as your "reference point" and use x values of 0 and 2 (number of years after the reference point).<br>
But you should be able to solve this problem easily without formal algebra (unless, of course, an algebraic solution is required).<br>
In 2 years from 2010 to 2012 the population increased by 25, from 42 to 67.  If the increase is linear, then in another 4 years the population will increase by 50; 67+50 = 117.<br>
Solving the problem using formal algebra is good practice; but solving a problem using logical reasoning is excellent exercise for the brain.