15问答网 > 初二数学要过程函数y＝kx+b的如右图，则方程kx+b等于0的解为？不等式kx+b＞0的解集为？

初二数学要过程函数y＝kx+b的如右图，则方程kx+b等于0的解为？不等式kx+b＞0的解集为？

2025-02-13 00:12:49

推荐回答（3个）

回答1：

kx+b等于0 y=0 所以就是函数与x轴的交点 1 所以解为1
kx+b>0 即函数在x轴的上面所以 x<1
同理 kx+b<0的解集为 x>1

回答2：

解：把A（1，0），B（0，3）带入y=kx+b
0=k+b
3=b
解得k= -3
b=3
所以y= -3x+3
① 令y=0 ② -3x+3＞0 ③ -3x+3-3＞0
-3x+3=0 x＞1 -3x＞0
x=1 所以原不等式的集解为x＞1 x＜0
所以原方程的解为x=1 所以原不等式的解集为x＜0

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初二数学 要过程 函数y＝kx+b的如右图，则方程kx+b等于0的解为？不等式kx+b＞0的解集为？

初二数学要过程函数y＝kx+b的如右图，则方程kx+b等于0的解为？不等式kx+b＞0的解集为？