绗?/p>
6
璇炬椂
涓�娆″嚱鏁颁笌涓�鍏冧竴娆℃柟绋嬨�佷竴鍏冧竴娆′笉绛夊紡
(
缁?/p>
)
鐭ヨ瘑瑕佺偣鍩虹缁?/p>
鐭ヨ瘑鐐?/p>
1
涓�娆″嚱鏁颁笌涓�鍏冧竴娆℃柟绋?/p>
1
.
宸茬煡涓�娆″嚱鏁?/p>
y=ax+
2
鐨勫浘璞′笌
x
杞寸殑浜ょ偣鍧愭爣涓?/p>
(3,0),
鍒欎竴鍏冧竴娆℃柟绋?/p>
ax+
2
=
0
鐨勮В涓?/p>
(
A
)
A
.x=
3
B
.x=
0
C
.x=
2
D
.x=a
2
.
宸茬煡鏂圭▼
4
x-b=
0
鐨勮В涓?/p>
x=
2,
鍒欑洿绾?/p>
y=
4
x-b
涓�瀹氱粡杩囩偣
(
A
)
A
.
(2,0)
B
.
(0,3)
C
.
(0,4)
D
.
(0,
-
3)
鐭ヨ瘑鐐?/p>
2
涓�娆″嚱鏁颁笌涓�鍏冧竴娆′笉绛夊紡
(
缁?/p>
)
3
.
(
娴庡崡涓�?/p>
)
濡傚浘
,
鑻ヤ竴娆″嚱鏁?/p>
y=-
2
x+b
鐨勫浘璞′氦
y
杞翠簬鐐?/p>
A
(0,3),
鍒欎笉绛夊紡
-
2
x+b>
0
鐨勮В闆?/p>
涓?/p>
(
C
)
A
.x>
B
.x>
3
C
.x<
D
.x<
3
4
.
濡傚浘鎵�绀?/p>
,
涓�娆″嚱鏁?/p>
y=ax+b
鐨勫浘璞＄粡杩?/p>
A
,
B
涓ょ偣
,
鍒欏叧浜?/p>
x
鐨勪笉绛夊紡
ax+b<
0
鐨勮В闆嗘槸
x<
2
.
5
.
鐢诲嚭鍑芥暟
y=-
x+
3
鐨勫浘璞?/p>
,
鏍规嵁鍥捐薄鍥炵瓟涓嬪垪闂
:
(1)
姹傛柟绋?/p>
-
x+
3
=
0
鐨勮В
;
(2)
姹備笉绛夊紡
-
x+
3
<
0
鐨勮В闆?/p>
;