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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.

 Number of pages 50 100 150 200 cost 1.75 2.55 3.35 4.15

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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#1
0

Can anyone help me

Guest Nov 17, 2017
#2
+91256
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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
0

I am really bad at algebra

Guest Nov 17, 2017
#3
+1

Guest Nov 17, 2017
#5
0

can someone explain it for me please

Guest Nov 17, 2017
#6
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but please explain in a simple way that is not complicated

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