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1、第 1 页 共 2 页初中数学一次函数的图象基础题初中数学一次函数的图象基础题一、单选题一、单选题(共共 10 道，每道道，每道 10 分分) 1.下列图形不能体现 y 是 x 的函数关系的是（ ）A. B. C. D. 2.下列函数中，是一次函数的选项（ ）A. B.y=x+1 C. D. 3.已知函数，当 k 时，它是正比例函数，当 k 时，它是一次函数.() A.=2；-2 B.=-2；2 C.=-2；2 D.=2；=2 4.已知 y-3 与 x 成正比例，且 x=2 时，y=7.则 y 与 x 的函数关系式为（） A.y=2x+3 B.y=2x-3 C.y-3=2x+3 D.y=3x-
2、3 5.直线 y=3x+9 与 x 轴的交点坐标是（） A.(3,2) B.(-3,0) C.(0,3) D.(0,-3) 6.已知某一次函数过点 A（2,2） ，且与直线 y=2x+1 平行，则此一次函数的表达式为（） A.y=2x+2 B.y=-2x+2 C.y=2x-2 D.y=-2x-2 7.下列一次函数中，y 的值随 x 值的增大而减小的有（）第 2 页 共 2 页A.y=x-1 B.y=1-2x C.y=3x+1 D.y=-1+2x 8.一次函数 y=kx+b 的图像经过第一、三、四象限，则（） A.k0，b0 B.k0，b0 C.k0，b0 D.k0，b0 9.已知某个一次函数的
3、图像过 A（-1,0）B（0,1） ，则其解析式为（） A.y=2x+1 B.y=x+1 C.y=2x+2 D.y=x-1 10.直线 y=kx+b 过点（2，2）且与直线 y=-2x 相交于点（1，a） ，则两直线与 x 轴所围成的 面积为（） A.1 B.1.5 C.2 D.2.5 V 1-Us+R4R3R2R1CLVIi1i2i3i4i5i6is9JWKffwvG#tYM*Jg&6a*CZ7H$dq8KqqfHVZFedswSyXTy#&QA9wkxFyeQ!djs#XuyUP2kNXpRWXmA&UE9aQGn8xp$R#͑GxGjqv$UE9wEwZ#QcUE%&qYpEh5
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