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System of equations

System of equations

From the course: Test Prep: GRE

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System of equations

- [Voiceover] In this video I'm going to go over what to do when you have a system of equations. So this word problem we have 80 people attending a fundraiser and we're collecting these donations. Everybody looks like donated either ten bucks or 25 bucks so a lot of times in a word problem, you might want to make an equation and see if you can solve it because often something is missing. In this case we're being asked how many people donated ten bucks so if we start to make an equation, we might say well there are x people who donated ten dollars and when that is added to the number of people, we'll call it y, that donated 25 dollars, that's going to equal our total donation amount so 1145. Hopefully that makes sense. That number times ten dollars that'll give us our total for the ten dollar donations and the number of the people who gave 25 dollars that'll give us our total for the 25 dollar donations. Okay, so the only problem is we only have one equation and we have two variables…

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