SOLUTION: 7 audio cassettes and 3 video cassettes cost rs 1110,while 5 audio cassettes and 4 video cassettes cost rs 1350 find the cost of an audio cassette and a video casette

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: 7 audio cassettes and 3 video cassettes cost rs 1110,while 5 audio cassettes and 4 video cassettes cost rs 1350 find the cost of an audio cassette and a video casette      Log On


   

Question 445895: 7 audio cassettes and 3 video cassettes cost rs 1110,while 5 audio cassettes and 4 video cassettes cost rs 1350 find the cost of an audio cassette and a video casette
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
Video--- x Cost
Audio=== y Cost
3x+7y=1100 .............1
4x+5y=1350 .............2
Eliminate y
multiply (1)by -5
Multiply (2) by 7
-15x-35y=-5500
28x+35y =9450
Add the two equations
13x=3950
/13
x= Rs.303.85 Cost of Video
plug value of x in (1)
3x+7y=1100
911.54 +7y=1100
7 y = 1100 -911.54
7 y = 188.46
y =Rs.26.92 Audio