find HCF of 210 and 55.Then exprees it in the form of 210x+55y.find the value of x and y.(lesson - rational numbers class 10)
Answers
Answer:
210 = 55 * 3 + 45
55 = 45 * 1 + 10
45 = 10 * 4 + 5
10 = 5 * 2
hence 5 is the HCF.
5 = 45 - 10 * 4 substitute the values of 10 and 45 from above equations.
= 210 - 55 * 3 - (55 - 45 ) 4
= 210 - 55 * 3 - 55 * 4 + 45 * 4
= 210 - 55 * 7 + (210 - 55 * 3) * 4
= 210 * 5 - 55 * 19
so x = 5 and y = -19
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another way : to find an infinite number of solutions.
210 x + 55 y = 5
42 x + 11 y = 1
11 (4 x + y) = 1 + 2 x
y is an odd number as RHS is odd and so LHS has to be odd. let y = 2 z+1. one of x and y is negative and the other is positive.
11 (4x + 2z+1) = 1 + 2x
42 x + 22 z + 10 = 0
21 x + 11 z + 5 = 0 --- (1)
11 (x+z) = - 5 (2 x + 1)
x+z is a multiple of -5 and perhaps (2x+1) /11
2 x +1 is an odd multiple of 11.
so let 2x + 1 = (2 v + 1) 11
2 x = 22 v + 10
x = 11 v + 5
then by use of (1),
11 z = - 5 - 21 * (11 v + 5) = - 5 - 231 v - 105 = - 231 v - 110
z = - 21 v - 10
y = - 42 v - 19
5 = HCF = 210 * (11 v + 5) - 55 * (42 v + 19)
x = 11 v + 5
y = - (42 v + 19)
v x y 210 * x + 55 * y
0 5 -19 5
-1 -6 23 5
1 16 -61 5
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