请教中一的数学题,谢谢高手解答

cjj82949321

     GIVEN the  equation of a line is -8x+4y=15,find  
      (a)  the  gradient of the line
      (b)   the y-intercept

cjj82949321

:o

cjj82949321

a)  A salesman sold 120 digital cameras in june,in july,the sale of digital cameras increased by 15%,find the number of digital cameras sold in july.
  (b)   james and his friends paid $135.90 for a meal,this amount included the 10%  service charge,find the amount. james and his friends paid for service charge

cjj82949321

:o

cjj82949321

:@

joycewenn

cjj 发表于 1-12-2012 16:34
a)  A salesman sold 120 digital cameras in june,in july,the sale of digital cameras increased by 15% ...

a) 120*(1+15%)

6) 135.9/(1+10%)

这是中学题目，感觉比上次小五的题目容易啊

cjj82949321

joycewenn 发表于 1-12-2012 21:40
a) 120*(1+15%)

6) 135.9/(1+10%)

请教过程和步骤

cjj82949321

特别是（b)

joycewenn

随便找个超市收据什么的，看看就知道了

centumvp2009

解答扫描了，站内你的邮件地址给我，我发给你……