Question

. The product of two rational numbers is −4/7 . If one of the number is −5/21 , find the other.​

Answer 1

Step-by-step explanation:

Let the required number be x. Then,

=(5/7)+x=(4/21)

By sending (5/7) from left hand side to the right hand side it change to −(5/7)

x=(4/21)−(5/7)

LCM of 21 and 7 is 21

Express each of the given rational numbers with the above LCM as the common denominator.

Now,

(21×1)

(4×1)

=

21

4

=

(7×3)

(5×3)

=

21

15

Then,

=(4/21)−(15/21)

=(4−15)/21

=(−11/21)

Hence the required number is (−11/21)

Answer 2

Step-by-step explanation:

solve the following linear equation:

a). ( 3X + 4 ) / 5 = ( 2X - 3 ) /3

b). 6X + 11 / ( 2X + 3 ) - ( 5X - 2 ) = 17/ 2

c). X -1 /4 + 7 - X / 3 - X / 6 = 2

d). X / 2 - 3X / 4 + 5x / 6 = 21

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