If 3x + 4y=17 and 5x+2y=23, what is the value of x-y?

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问题 If 3x + 4y=17 and 5x+2y=23, what is the value of x-y?

选项

答案3

解析 The correct answer is 3. In order to solve this system of equations, subtract the first equation from the second. The result is 2x - 2y = 6. Factor out 2 to get 2(x-y)= 6. Divide both sides by 2 to get x-y= 3.

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If 3x + 4y=17 and 5x+2y=23, what is the value of x-y?

GRE QUANTITATIVE

GRE

InWesternculture,anengagementbeginswith"yes"toasimplequestion:"Willyoumarryme?"Theseheart-stoppingwordsoften

Somepeoplethinkoflifeasagame.Therearesimilaritiesbetweenlifeandgames;bothcanbeplayed,bothhaverules,andbot

AsIwasgrowingup,mylifewentaroundsoccer(足球).Iplayedonthenationalyouthsoccerteams,andtravelledtoEurope.Atag

I’dplayfootballwithyounowifI_____tenyearsyounger.

Asmallerpopulationmaymean______.Accordingtothepassage,alargepopulationwillprovideachancefordeveloping______.

Agoodmodernnewspaperisanextraordinarypieceofreading.Itisremarkablefirstforwhatitcontains:therangeofnewsfro

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Inthefigureabove，PQisadiameterofcircleO，PR=SQ，and△RSTisequilateral．IfthelengthofPQis2．whatisthelengthofRT

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