急!!線型函數會通過y=ax+b之圖形通過(2.0) (1.3)兩點,則必也會通過下列哪一點? A（－１.１０） B(4.2) C(-2.5) D(-9.33)?
回答 (2)
2016-10-18 2:45 pm
✔ 最佳答案
Soly=ax+b
2a+b=0
a+b=3
(2a+b)－(a+b)=0－3
a=－3
b=6
y=－3x+6
y(－1)=3+6=9<>10 A錯
y(4)=－12+6=－6<>2 B錯
y(－2)=6+6=12<>5 C錯
y(－9)=27+6=33 D對
2016-10-18 3:19 pm
Sub (2,0),
0=2a+b
Sub (1,3),
3=a+b
solve simultaneous equation we get a= -3, b=6
then we test points,
we get answer answer D.
0=2a+b
Sub (1,3),
3=a+b
solve simultaneous equation we get a= -3, b=6
then we test points,
we get answer answer D.
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