The cost for laminating varies directly with the number of pages laminated. A customer had 19 pages laminated and paid $16.15.

How much will the customer pay to have 31 pages laminated?

$

Question

The cost for laminating varies directly with the number of pages laminated. A customer had 19 pages laminated and paid $16.15.

 

How much will the customer pay to have 31 pages laminated?

 

$

anonymous · Answer

@DanJS can u help me please?

danjs · Answer

hi

danjs · Answer

First sentence - varies directly - y = k*x

danjs · Answer

we need to find the constant of proportionality ,,, k using the point they gave you.

danjs · Answer

Cost = k*# pages

anonymous · Answer

so what is the answer?

danjs · Answer

16.15 = k*19

k = 0.85
so

Cost = 0.85*(#pages)

danjs · Answer

The cost of 31 pages will be:

Cost = 0.85*(31 pages) = 
26.35

anonymous · Answer

thxs:)

danjs · Answer

varies directly:  $$y=k*x$$

varies indirectly: $$y = k*\frac{ 1 }{ x }$$