方程式~~~急
2006-10-31 3:52 am
Bobby saves a fixed amount of money every day.He find the price of a model is $70 more than his saving in 5 days or $10 more than his saving in 9 days.How much does he save each day?(方程式解答,要步驟)
回答 (2)
2006-10-31 3:58 am
✔ 最佳答案
Let $x be the amount that he saves each day5x + 70 = 9x + 10
70 - 10 = 9x - 5x
4x = 60
x = 15.
2006-10-30 20:06:18 補充：
He saves $15 each day.
2006-10-31 4:12 am
Let Bobby saves $X each day
5x + 70 = 9x + 10
4X = 60
x =15
Bobby saves $15 each day
5x + 70 = 9x + 10
4X = 60
x =15
Bobby saves $15 each day
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https://hk.answers.yahoo.com/question/index?qid=20061030000051KK05173