Posted by Vp on Monday, September 3, 2007 at 1:01pm.
In the first case, each increase of 2 in x increases y by 6 (three times as much as the increase in x). To get from x=9 to x=25, x must increasae by 16, so y must increase by 48, from 26 to 74.
#2 can be done the same way, and is even easier. Increase x by 2 and y must increase by 10. You don't need the equation.
Could you break this down, step by step - and the teacher requires and equation for both
from the first set of data, select two ordered pairs,
e.g. (3,8) and (5,14)
so the equation is y = 3x + b
but (3,8) lies on this so
and the equation is
so when x=25
do the second one the same way
Thanks so much - I do understand the logic - is there an easier way to set up this equation fro a 5th grader
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