中一方程式

100 - 18X=Y......(1)

100 - 13X = 48......(2)

From (2) 13X=100-48=52

X=4......(3)

Sub.(3)into (1) Y=100-18x4=28

2008-03-24 21:03:04 補充：
F.3

100 - 18X=Y......(1)

100 - 13X = 48......(2)

From (2) 13X=100-48=52

X=4......(3)

Sub.(3)into (1) Y=100-18x4=28

2008-03-21 08:05:17 補充：
100 - 18X=Y......(1)

100 - 13X = 48......(2)

From (2) 13X=100-48=52

X=4......(3)

Sub.(3)into (1) Y=100-18x4=28

100 - 18X=Y......(1)

100 - 13X = 48......(2)

From (2) 13X=100-48=52

X=4......(3)

Sub.(3)into (1) Y=100-18x4=28

I don't know whether it is your meaning

from 志榮買了x個漢堡包.他給店員一張＄１００,店員找回$48給他.
根據題意,寫出一個以x為未知數的方程．

漢堡包每個$13.

we get 100 - 13x = 48
52 = 13x
x = 4

so for 某超級市場內,一盒牛奶售$18.美宜購買x盒牛奶,她給店員$100,
店員須找回$(_____)給美宜.

店員須找
100 - 18 * x
= 100 - 18 * 4
= 100 - 72
= 28

1) 100-18x=店員須找回$(_____)給美宜
2) 100-13x=48
x係購買該物件的數目

2008-03-20 22:23:17 補充：
我中四嫁啦

某超級市場內,一盒牛奶售$18.美宜購買x盒牛奶,她給店員$100,
店員須找回$(_18-18x_)給美宜.


志榮買了x個漢堡包.他給店員一張＄１００,店員找回$48給他.
根據題意,寫出一個以x為未知數的方程．漢堡包每個$13.

100-13x=48