k1x
(1)把A(3,4)代入y1=k1x,
得3K1=4,
∴K1=4/3,
作AC⊥y軸於C,
∵點A(3,4)
∴OA=√(3?+4?)=5,
∴OB=OA=5,
∴B(0,-5)把(3,4)、(0,-5)代入y2=k2+b,得
3K2+b=4,
b=-5,
∴K2=3
(2)AB=√(AC?+BC?)=√(3?+9?)=3√10
有疑問,請追問;若滿意,請采納,謝謝!
得3K1=4,
∴K1=4/3,
作AC⊥y軸於C,
∵點A(3,4)
∴OA=√(3?+4?)=5,
∴OB=OA=5,
∴B(0,-5)把(3,4)、(0,-5)代入y2=k2+b,得
3K2+b=4,
b=-5,
∴K2=3
(2)AB=√(AC?+BC?)=√(3?+9?)=3√10
有疑問,請追問;若滿意,請采納,謝謝!