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A yearbook printer charges based on the number of pages printed. Here is a table that shows the cost of some recent yearbooks.

 

chart
Number of pages50100150200
cost1.752.553.354.15

 

 

 

 

Which equation gives the cost, y, in terms of the number of pages, x?

 

 

 

A. y=0.016x+0.95

 

 

B. y=0.016x+1.75

 

 

C. y=0.016x+48.25

 

 

D. y=52.6x+0.95

Guest Nov 17, 2017
edited by Guest  Nov 17, 2017
edited by Guest  Nov 17, 2017
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9+0 Answers

 #1
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0

Can anyone help me

Guest Nov 17, 2017
 #2
avatar+91256 
+2

The costs (y) are going up by 0.80   andthe pages (x) is going up by 50

 

so the gradient is     rise /run = change in y/change in x  =  0.8/50   = 0.016

 

so

y= 0.016x + something 

 

Substitute any of the known values into the equation to find what that something (b) (yintercept) is.

Check by subing in a different pair and checking that it works.

 

You can post your working if you are not sure that your understand.

Melody  Nov 17, 2017
edited by Melody  Nov 17, 2017
 #4
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0

I am really bad at algebra

Guest Nov 17, 2017
 #3
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+1

the only thing I understood about that answer is that D is definitely not the answer

Guest Nov 17, 2017
 #5
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0

can someone explain it for me please

Guest Nov 17, 2017
 #6
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0

but please explain in a simple way that is not complicated

Guest Nov 17, 2017
 #7
avatar+91256 
+2

One  known value is    

y= 2.55 when x=100

 

I have told you that    y= 0.016x + something 

 

y= 0.016x+b

so

Sub in your known values of x and y to find out the value of b

                          (which is the y intercept or the cost of prinint irrespective of the number of pages.)

 

2.55 = 0.016*100 +b

 

Now you can solve this to get the missing b value.

Melody  Nov 17, 2017
 #8
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+1

d****t turns out it was A But I chose B and that's when 

I found out it was wrong

Guest Nov 17, 2017
 #9
avatar+91256 
+1

ok but have you understood or even tried to understand any of the reasoning I have given you so that maybe you can get it right next time?

Melody  Nov 17, 2017

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