# Finite Math help please and thank you..

• Jan 25th 2009, 12:55 PM
johnewton
Finite Math help please and thank you..
Here is the problem..

Robinson Wholesale Company paid $1340 for 500 items. Later they bought 800 items for$1760. Assume that the cost is a linear cost function of the number of items.
Write the equation..

Thank you for any help you may provide! I am clueless with this stuff!!

John
• Jan 25th 2009, 01:26 PM
metlx
$
1760 = 800k
$

$
1340 = 500k
$

$
800k - 500k= 1760 - 1340
$

$
300k = 420
$

$
k = \frac {420}{300} = \frac{7}{5}
$

$
y = kx +n = \frac {7}{5}x + 0 = \frac {7}{5}x
$

x = items bought
k = koeficient (or cost of 1 item)
y = cost
• Jan 25th 2009, 02:36 PM
johnewton
awesome,
this paints a very clear picture for me. ty!!