if 4a + 5b + 9c = 36 and 6a + (15/2)b + 11c = 49 , then the value of c is
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4a+5b+9c=36
=>4a+5b=36-9c————>equation 1
6a+7.5b+11c=49
Multiplying both sides by 2 we get,
12a+15b+22c=98
=>12a+15b=98-22c
=>3(4a+5b)=98-22c
From equation 1 we put value of (4a+5b) we get,
3(36-9c)=98-22c
=> 108-27c=98-22c
=>27c-22c=108-98
=>5c=10
=>c=2
=>4a+5b=36-9c————>equation 1
6a+7.5b+11c=49
Multiplying both sides by 2 we get,
12a+15b+22c=98
=>12a+15b=98-22c
=>3(4a+5b)=98-22c
From equation 1 we put value of (4a+5b) we get,
3(36-9c)=98-22c
=> 108-27c=98-22c
=>27c-22c=108-98
=>5c=10
=>c=2
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