已知一次函数y=kx-4,当x=2时,y=-3. (1)求一次函数的解析式;

已知一次函数ykx4,当x2时,y=-3

(1)一次函数的解析式;

(2)将该函数的图象向上平移6个单位,求平移后的图象与x轴交点的坐标

答案

解:(1)由已知得:,解得          (2)

一次函数的解析式为:    (3)

(2)将直线向上平移6个单位后得到的直线是:    (4)

时,平移后的图象与轴交点的坐标是(—40)       (6)

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