algebra

Algebra Level 2

If Y =a + b/x , where "a " and "b" are constants and if y = 1 when x= -1, and y = 5; when x= -5, then a + b


The answer is 11.

Kunal Gupta by kunal gupta , 20, India

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3 solutions

Mahmoud Sayed
Jan 24, 2015

1 Helpful 0 Interesting 0 Brilliant 0 Confused
Lu Chee Ket
Jan 24, 2015

1 = a - b

5 = a - b/ 5 => 25 = 5 a - b

24 = 4 a => a = 6

a = 6 and b = 5 checked to satisfy both equations,

a + b = 6 + 5 = 11

0 Helpful 0 Interesting 0 Brilliant 0 Confused
Akshat Rahurkar
Jan 24, 2015

put x=-1 ;y=1(given) therefore, a-b=1 similarly put x=-5;y=5(given),therefore 5a-b=25 By Elimination method we get a=6 and b=5. so a+b=11

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