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March 31st, 2014, 07:44 PM   #1
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Is it possible to form the equations without looking at the answer choices?

I wanted to know if it's possible to form the equations, without plugging in values. Question is attached below.
Attached Images attachment.jpg (88.2 KB, 7 views) April 1st, 2014, 01:52 AM #2 Senior Member   Joined: Dec 2013 From: Russia Posts: 327 Thanks: 108 A linear function (whose graph is) passing through points $\displaystyle (x_1,y_1)$ and $\displaystyle (x_2,y_2)$ has equation $\displaystyle \frac{y-y_1}{x-x_1}=\frac{y_2-y_1}{x_2-x_1}$. In this case, $\displaystyle x_1=7$, $\displaystyle x_2=9$, $\displaystyle y_1=30$ (thousand) and $\displaystyle y_2=22$. So, the equaton is $\displaystyle \frac{y-30}{x-7}=-\frac{8}{2}=-4$ i.e., $\displaystyle y-30=4(7-x)=28-4x$ $\displaystyle y=58-4x$. Thanks from MarkFL, duc and pnf123 April 1st, 2014, 11:48 AM #3 Math Team   Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1039 Hockey Evgeny, are you related to Sergei? Legends of Hockey -- NHL Player Search -- Player -- Sergei Makarov April 1st, 2014, 11:50 AM #4 Senior Member   Joined: Dec 2013 From: Russia Posts: 327 Thanks: 108 Ha-ha, no. Makarov is not the most popular last name in Russia, but it is not unusual, either. Tags answer, choices, equations, form Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Similar Threads Thread Thread Starter Forum Replies Last Post triplekite Algebra 3 December 7th, 2012 02:57 PM Johnny44 Algebra 3 February 17th, 2012 01:06 PM jakeward123 Differential Equations 23 March 10th, 2011 02:17 PM astrix Advanced Statistics 1 August 25th, 2009 05:11 AM Thom Algebra 0 November 22nd, 2008 01:36 AM

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