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

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问题 4x-y=63 3y+x=6

选项

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

解析

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

GRE QUANTITATIVE

GRE

SpeakerA:Hello,Iwanttobuysomeclothesformygirlfriendforherbirthdaypresent.SpeakerB:Noproblem,sir.【D8】______S

Nosoonerhadhesatdowntolunch______therewasaknockatthedoor.

WhentheUnitedStatesCongresscreatedYellowstoneNationalParkin1872,thegoalwastosetasideaplacewhereAmericanscou

Thetopoftheworldisawonderland.Inwinter,thetemperatureoftenfallsto-30°Fandthesunneverrises.Theoceanissurr

Somepeoplethinkoflifeasagame.Therearesimilaritiesbetweenlifeandgames;bothcanbeplayed,bothhaverules,andbot

Allthefollowingcasesareon-the-jobsmokingexceptthat.Passivesmokingmeans.

Allthefollowingcasesareon-the-jobsmokingexceptthat______.Manymanagersdonotseemtobeinfavorofon-the-jobsmokin

Ourpreferencesforcertaincolorsare______accordingtothepassage.WhichofthefollowingstatementsisTRUEaccordingto

Tousitseemssonaturaltoputupanumbrellatokeepthewateroffwhenitrains,butactuallytheumbrellawasnotinvented

Agoodmodernnewspaperisanextraordinarypieceofreading.Itisremarkablefirstforwhatitcontains:therangeofnewsfro

真人养脏汤中配伍炙甘草的意义是

黄体酮醋酸氢化可的松

唾液腺炎最主要的感染途径是

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由一列横队变成两列横队时，学生应先报数。()

当讲述自己幼年读书的时光时，作者的叙事，使人有如临其境之感，好像也回到了童年读书时代，并从中受到了强烈的。填入划横线部分最恰当的一项是：

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GRE QUANTITATIVE

GRE

SpeakerA:Hello,Iwanttobuysomeclothesformygirlfriendforherbirthdaypresent.SpeakerB:Noproblem,sir.【D8】______S

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Somepeoplethinkoflifeasagame.Therearesimilaritiesbetweenlifeandgames;bothcanbeplayed,bothhaverules,andbot

Allthefollowingcasesareon-the-jobsmokingexceptthat______.Passivesmokingmeans______.

Allthefollowingcasesareon-the-jobsmokingexceptthat______.Manymanagersdonotseemtobeinfavorofon-the-jobsmokin

Ourpreferencesforcertaincolorsare______accordingtothepassage.WhichofthefollowingstatementsisTRUEaccordingto

Tousitseemssonaturaltoputupanumbrellatokeepthewateroffwhenitrains,butactuallytheumbrellawasnotinvented

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真人养脏汤中配伍炙甘草的意义是

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由一列横队变成两列横队时，学生应先报数。()

当讲述自己幼年读书的时光时，作者________的叙事，使人有如临其境之感，好像也回到了童年读书时代，并从中受到了强烈的________。填入划横线部分最恰当的一项是：

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TheUnitedStatesiswidelyrecognizedtohaveaprivateeconomybecauseprivatelyownedbusinessplay【C1】______roles.TheAmer

Allthefollowingcasesareon-the-jobsmokingexceptthat.Passivesmokingmeans.

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