Thursday

July 24, 2014

July 24, 2014

Posted by **sh** on Thursday, December 9, 2010 at 12:24am.

A company can sell 4500 pairs of sunglases monthly when the price is $5. When the price of a pair of sunglasses is increased by 10%, the demand drops to 4250 pairs a month. Assume that the demand equation is linear.

Find the demand equation

- Calculus -
**MathMate**, Thursday, December 9, 2010 at 8:05amAssume the demand equation is linear.

We have two known points:

P1(5,4500), and P2(5.50,4250)

To fit a straight line between two known points, we can apply the two-point form of line, namely,

(x-x1)/(x2-x1)=(y-y1)/(y2-y1)

The equation seems long, but its symmetry makes it very easy to memorize.

Substitute x1=5,y1=4500,x2=5.5,y2=4250, we get

(x-5)/(5.50-5)=(y-4500)/(4250-4500)

-250(x-5)=0.5(y-4500)

y=-500x+7000

**Related Questions**

inter Alegbra - A start up computer company can sell 1000 computers if they ...

MaTH - I am trying to work this problem and need help. Mary bought 2 pairs of ...

COLLEAGE ALEGEBRA - QUES # 1 a STARTUP COMPUTER CAN SELL 1000 COMPUTERS IF THEY ...

Pre-Cal - I've been trying to work this problem out for the past week and still ...

math - a computer company can sell 1000 computers if they price them at $500. ...

inter Alegbra - A startup company can sell 1000 computers if they price them at...

MAth - I don't know how to begin this one-help Janie bought 2 pairs of identical...

College Algebra - A company is planning to produce and sell a new line of tvs. ...

math - jeff bought 6 pairs of shoes and 4 jerseys for 560. Jersies cost 1/4 ...

Mathematics - A company purchased 10,000 pairs of men’s slacks for 19.26 per ...