已知矩形的面积为8,那么它的长y与宽x之间的关系用图象大致可表示为…【】-八年级数学

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• （2011•攀枝花）如图，已知反比例函数（m是常数，m≠0），一次函数y=ax+b（a、b为常数，a≠0），其中一次函数与x轴，y轴的交点分别是A（﹣4，0），B（0，2）．（1）求一次函数的关系式；
• （2011广西梧州，20，6分）已知B（2，n）是正比例函数y=2x图象上的点．（1）求点B的坐标；（2）若某个反比例函数图象经过点B，求这个反比例函数的解析式．-八年级数学
• （2011•毕节地区）一次函数y=kx+k（k≠0）和反比例函数在同一直角坐标系中的图象大致是（）-八年级数学
• 已知点A、B分别是轴、轴上的动点，点C、D是某个函数图像上的点，当四边形ABCD（A、B、C、D各点依次排列）为正方形时，称这个正方形为此函数图像的伴侣正方形。例如：如图，正方-八年级数学
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• 一个圆柱的侧面展开图是一个面积为4平方单位的矩形，那么这个圆柱的母线长L和底面半径r之间的函数关系是[]A．反比例函数B．正比例函数C．一次函数D．二次函数-八年级数学
• 下列各函数①、②、③、④、⑤、⑥、⑦和⑧y=3x-1中，是y关于x的反比例函数的有：（）（填序号）。-八年级数学
• 形如（k是常数，且k≠0）的函数称为（），其中x是自变量的取值范围是（），y是函数，k是比例系数。-八年级数学
• 反比例函数y=-中，比例系数k=（）。-九年级数学
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