this is a question about rate of change, it should be so easy, but i keep getting it wrong

label Algebra
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Sep 13th, 2015

Thank you for the opportunity to help you with your question!

The data can be represented as a linear function, in fact the linear function is

j(x)=3x+15  (i)

You can be test this as shown below



and so on

Rate of change=(21-9)/(2--2)=12/3=3,

Remember equation of a straight line is

y=mx+c     (ii)

where m is the slope or rate of change

Compare (i) and (ii)

m=3, c=15(is the y intercept)

Please let me know if you need any clarification. I'm always happy to answer your questions.
Sep 14th, 2015

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