Maths(f.1-f.2)

2007-09-01 6:19 am
In each of the following, determine which of the given points lie(s) on the given line.

a) y = x - 3 ; ( 0, -3 ), ( 2, 1)

b) x = 2y + 1 ; ( -2, 0 ), ( 3, 1 )

回答 (3)

2007-09-01 6:27 am
✔ 最佳答案
a) put (0, -3) into y=x-3

x-3= 0-3 = -3 =y

put (2,1) into y=x-3

x-3= 2-3 = -1 <> y

So, (0, -3) lie on the given line

b) put ( -2, 0) into x=2y+1

2y+1 = 2*0 +1 =1 <>x

put (3, 1) into x=2y+1

2y+1 = 2* 1+1= 3=X

So, (3,1) lie on the given line
2007-09-01 6:31 am
呢條數好易喎
a) sub(0,-3)into equation
我地看線時,就把此(0,3)代入equation裹。
因為由於(x,y)和(0,3)是一樣的,所以就要使x=0,y=-3
於是:y=x-3(代x=0,y=-3)
-3=0-3
=-3
兩邊一樣,所以我地知道(0,3)在這條線上。
你再用同樣方法試下(2,1),呢個點最後你會計到並不等的,所以這個不是有線上。

b題同樣做法,都是代數,兩邊等就係個個點
參考: 代數呀,記住啦
2007-09-01 6:24 am
a)(0,-3)
b)(3,1)


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