Answers

2014-06-22T22:49:47+05:30
Simultaneous Equation:
7x-8y=11         8x-7y=7
* 7                   * -8
49x-56y=77    -64x+56y= -56
On subtracting we get,
- 15x= 21
x= 21/ -15
x= - 7/5
7* -7/5 - 8y =11
-49/5 - 8y=11
-8y = 104/5
y= -51/20

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2014-06-22T23:55:19+05:30
7x-8y-11=0 and x8-7y-7=0------------(1)
from(1) 8x=(7+7y) or x=(7+7y)/8--------(2)
7[
(7+7y)/8]-8y-11=0
=>(49+49y)/8-8y-11=0
=>49+49y-64y-88=0
=>-39-15y=0
=>y=-39/15-------(3) 
put this value in (2) to get the value of x.
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