国际学校八年级数学试卷.docVIP

Choose(30’)

1)Whichgraphrepresentthelinearfunction？()

A.B.C.D.

2)Atafactory,thecostofmakingdifferentnumbersoftoothbrushesisshowninthetablebelow.()

Alinearfunctionmodelsthecostbasedonthenumberoftoothbrushesmade.Whichstatementabouttherateofchangeofthisfunctionistrue?

A.Thecostincreasesby$1.50foreachadditionaltoothbrushmade.

B.Thecostincreasesby$4.50foreachadditionaltoothbrushmade.

C.Thecostincreasesby$9.00foreachadditional3toothbrushesmade.

D.Thecostincreasesby$18.00foreachadditional3toothbrushesmade

3)Whatisanexpression?()

A.Aformulawithanequalssign.B.Aformulawithaplussign.

C.Aformulawithoutaplussign.D.Aformulawithoutanequalssign.

4)TriangleAandtriangleBaregraphedonthecoordinateplanebelow.WhichsequenceoftransformationswillmaptriangleAontoitscongruentimage,triangleB?()

A.areflectionoverthe-axis,thenareflectionoverthe-axis

B.atranslationunitsdown,thenareflectionoverthe-axis

C.areflectionoverthe-axis,thenatranslationunitstotheleft

D.arotationclockwiseabouttheorigin,thenatranslationunitstotheleft

5)Whichstatementbestdescribesthedatainascatterplotwherethey-valuesaredecreasingasthex-valuesareincreasing?()

A.Thedatacanbestbemodeledbyaverticalline.

B.Thedatacanbestbemodeledbyahorizontalline.

C.Thedatacanbestbemodeledbyalinewithapositiveslope.

D.Thedatacanbestbemodeledbyalinewithanegativeslope.

6)Whichsetoforderedpairsdoesnotrepresentafunction?()

A.{(1,10),(3,18),(5,26),(7,34),(9,24)}B.{(2,10),(3,20),(4,15),(5,5),(6,25)}

C.{(0,8),(5,4),(10,0),(15,4),(20,8)}D.{(9,1),(6,2),(3,3),(6,4),(9,5)}

7)Usingthefactoringmethod,solvethequadraticequation:x2+4x+4=0()

A.0and1