anonymous
  • anonymous
Algebra!
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
A picture is enlarged by keeping its width the same and increasing its length. The scatter plot below shows the perimeter of the picture (y) for different lengths (x):
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anonymous
  • anonymous
Which function best represents the data in the scatter plot? y = 2x − 20 y = 2x + 20 y = x − 20 y = x + 20
anonymous
  • anonymous
I know is B or D. Leaning more towards B.

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anonymous
  • anonymous
take (20,60) and (50,120)
anonymous
  • anonymous
Okay, hold up.
anonymous
  • anonymous
120 - 60 --------- 50 - 20
anonymous
  • anonymous
So your gradient is 2.
anonymous
  • anonymous
60 --- = 2 30
anonymous
  • anonymous
Yes.
anonymous
  • anonymous
y=2x+c
anonymous
  • anonymous
And, since it is a positive slope it must be, B y = 2x + 20
anonymous
  • anonymous
now set y=60 and x=20 to find c
anonymous
  • anonymous
no not neccessary, the +20 or -20 is the y intercept.
anonymous
  • anonymous
negative slope is when you have a negative mx
anonymous
  • anonymous
Ok, so, what do I do for Step 2?
anonymous
  • anonymous
anonymous
  • anonymous
so after you set the value you should get 60=2(20)+c. solve for c.
anonymous
  • anonymous
So your answer should be 20. Therefore, answer is y=2x+20.
anonymous
  • anonymous
Radical!!!

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