) If 5x = 4y. then to find the value of the ratio 3x2 + y2
3x2 - y2
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Answer:
3x +4y = 9
----------- ---
x + 2y 4
9x + 18y = 12x + 16y
2y = 3x
y = 3
---- x
2
We have to find ratio
3x + 5y = 9
------------- ----
3x - y 4
Putting y = 3
---- x
2
3x + 15 21
--- x ---- x
2 2
---------------- = -------------
3x - 3 3
--- x ---- x
2 2
= 7
---- = 7 : 1
1
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