Answers

2016-03-24T19:06:04+05:30
Equation will
be
X×y=400
(I am not sure you may confirm it)
0
2016-03-25T16:29:16+05:30
It will be 10x+4y=400
=> 10x+47-400=0
Since Running upstairs cause 10cal/min loss and walking causes 4cal/min loss.
1 5 1
10x+4y-400=0 is in ax+by-c=0 form
its wrong