MATH QUESTION

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Discus: SAT/ACT Tests and Test Preparation: May 2003 Archive: MATH QUESTION
 By Akaflex (Akaflex) on Sunday, May 04, 2003 - 07:44 pm: Edit

The time T, in hours, to produce X units of a product is given by the formula T = pX + s, where p and s are constants. If it takes 265 hours to produce 100 units and 390 hours to produce 150 units, what is the value of s?

can some1 help me solve this

 By Physicsstud (Physicsstud) on Sunday, May 04, 2003 - 08:20 pm: Edit

265=100p+s
390=150p+s

set up system of equations so 150p+s=390
100p+s=265

Subtract so you get rid of s. This leaves you with 50p=125 p=2.5

Plug it back into either equation

265=100(2.5)=s 265-250 =15 which equals S.

 By Physicsstud (Physicsstud) on Sunday, May 04, 2003 - 08:20 pm: Edit

265=100p+s
390=150p+s

set up system of equations so 150p+s=390
100p+s=265

Subtract so you get rid of s. This leaves you with 50p=125 p=2.5

Plug it back into either equation

265=100(2.5)=s 265-250 =15 which equals S.

 By Andrew123s (Andrew123s) on Sunday, May 04, 2003 - 08:21 pm: Edit

I vaguely remember this question. Was it from 10 real SATs?

 By Akaflex (Akaflex) on Sunday, May 04, 2003 - 08:26 pm: Edit

oh man thanks i didnt even notice how easy it was juss a little thinking thanks alot