4x-y=63 3y+x=6

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问题 4x-y=63 3y+x=6

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答案 Line up the like terms in both equations: 4x-y=63 x+3y=6 Multiply the top equation by 3 and add the equations: 12x-3y=189 x+3y=6 Note that the y terms cancel out: 13x=195 x=15 Now substitute 15 for x in one of the equations. x+3y=6 15+3y=6 3y=-9 y=-3

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本试题收录于： GRE QUANTITATIVE题库GRE分类

GRE QUANTITATIVE

GRE

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4x-y=63 3y+x=6

GRE QUANTITATIVE

GRE

Traditionally,universitieshavecarriedouttwomainactivities;researchandteaching.Manyexpertswouldarguethatboththes

Computertechnologyisadvancingsofastthatoldhardwarequicklybecomescompletelyobsolete.Theelectronicwaster(e-waste)

TheannualcampaigntomakeSingapore’sthreemillionpeoplemorepoliteendedyesterdayandwasimmediatelyfollowedbyanother

Itwasacoldwinterday.AwomandroveuptotheRainbowBridgetollbooth(收费站)."I’mpayingformyself,andforthesixcarsb

WhentheUnitedStatesCongresscreatedYellowstoneNationalParkin1872,thegoalwastosetasideaplacewhereAmericanscou

Nooneknowshowmanlearnedtomakewords.Perhapshebeganbymakingsoundslikethosemadebyanimals.Perhapshegruntedlik

Directions:Forthispart,youareallowed30minutestowriteacompositiononthetopic"GettingtoKnowtheWorldOutsideth

AsTheplanecircledovertheairport,everyonesensedthatsomethingwaswrong.Theplanewasmovingunsteadilythroughtheair

Thewaypeopleholdtothebeliefthatafunfilled,painfreelifeequalshappinessactuallyreducestheirchancesofeveratta

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