MATH~~~~~~~~~~~~`5

2007-03-08 3:51 am

1)has a gradient of 3 and passes through the origin.
2)has a gradient of 1 and a y-intercept of 2.
3)passes through the origin and point ( -3, 6 ).
4)passes through the points ( 6, 0 ) and ( 0, 3).
5)passes through the points ( 0, 3) and ( -2, -3 ).

回答 (1)

Elise

2007-03-08 4:30 am

✔ 最佳答案

首先，我想知道你究竟想問d咩？
係唔係問straight line ge equation?

1) (y-0) / (x-0) = 3 (用point-slope form)
y / x = 3
y = 3x

2) (y-2) / x = 1 (都係用point-slope form)
y-2 = 1(x)
y-2 = x
x-y+2 = 0 (唔肯定岩唔岩)

3) (y-0) / (x-0) = (y-6) / [x-(-3)] (用 two-point form)
y / x = (y-6) / (x+3)
y(x+3) = x(y-6)
xy+3y = xy-6x
3y = -6x
y = -2x

4 and 5 同第3題一樣，都係用 two- point form.
我俾答案你，你自己試下計啦^^

4)3x+6y-18=0
5)3x-y+3=0

希望可以幫到你啦

參考: 我讀理科...

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