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2061vv.com:14.3用函数观点看方程(组)与不等式(第三课时)14.3.3一次函数与二元一次方程(组)02_图文

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人教版八年级(上册)

第十四章一次函数
14.3用函数观点看方程(组)与不等式 (第三课时)

对于方程3x+5y =8如何用x表示y?

研究探索

y=

.

是不是任意的二元一次方程都能进行这样的转化呢?

(1)2x - y =0
1 1 (2) x + y=6 3 2

对于直线上每个点(x ,y),则 x 、y 是不是方程的解?

在同一直角坐标系中画出函数 3 8 ? x + y= 与 y = 2 x - 1的图象 5 5 这个交点(1,1)是 方程组

的解吗? 问:当自变量取何值时,函数 3 8 ? x + y= 与 y = 2 x - 1的值相等? 5 5 这个函数值是什么?

问:当自变量取何值时,函数 3 8 ? x + y= 与 y = 2 x - 1的值相等? 5 5 这个函数值是什么? 与解方程组: 是同一个问题吗?

练习
市内通话问题

方式一:月租费30元,0.40元/分 方式二:0.60元/分
如何选择计费方式更省钱?

y
250

y2=0.6x
(x为自然数)

200

150

100

50

O

. . . . . . . . . . .
50 100 150 200

y1=50+0.4x
(x为自然数)

250

300

350

x

……

让我们走进 作业超市

作业: P129页习题 14.3第6题、第9题.

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