已知y与x+1.5成正比例,且x=2时,y=7.
(1)求y与x之间的函数表达式;
(2)若点P(-2,a)在(1)所得的函数图象上,求a.
(1)求y与x之间的函数表达式;
(2)若点P(-2,a)在(1)所得的函数图象上,求a.
更新时间:2017-11-22 15:54:47
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【推荐1】已知函数
.
(1)当
为何值时,
是
的一次函数?
(2)当
为何值时,
是
的正比例函数?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1be61725d712bf17517a44cada6172d.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐2】写出下列各题中
与
的解析式,并判断
是否是
的正比例函数?
(1)电报收费标准是每个字0.1元,电报费
(元)与字数
(个)之间的函数关系;
(2)地面气温是28℃,如果每升高1km,气温下降5℃,则气温
(℃)与高度
(km)的关系;
(3)圆面积
(cm²)与半径
(cm)的关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(1)电报收费标准是每个字0.1元,电报费
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)地面气温是28℃,如果每升高1km,气温下降5℃,则气温
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)圆面积
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐1】如图,在平面直角坐标系中,一次函数
的图象经过点
,且与正比例函数
的图象交于点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4da1f7849f571cfc1d21a702a1228128.png)
(1)求一次函数
的解析式;
(2)若直线
与
轴交于点
,若连接
后,请直接写出
的面积是______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e6c8170dd3ad55d366c866dfa21c7df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a71456427cf82a02e26476a1eea5d76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4da1f7849f571cfc1d21a702a1228128.png)
(1)求一次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://img.xkw.com/dksih/QBM/2021/7/15/2764882232901632/2802155467104256/STEM/2aa881fa-c16f-4cf1-9481-b74ca66d629e.png)
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名校
【推荐2】在平面直角坐标系中,线段
的端点分别为
,
.
所在直线的表达式.
(2)如图,点
,
,点
从点
沿
以每秒2个单位长度的速度运动到点
,设运动时间为
秒.
①连接
,
,当
的周长最短时,求点
的坐标;
②当直线
与线段
有交点时,直接 写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5adf42b0d54d48c484f6e5cedd954fbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec8cae5963d0ea8fd1d1d013c1f9a0c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
(2)如图,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed4ec13997c8c34ff2484491e4410dc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3ab913258a2f938295dc5a769db626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
①连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db8305c4ffbf876642440c3d28e91e9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e99675fa03da205c4499967c9d908412.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
②当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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