Question

the sum of two rational numbers is minus 1 by 2 if one of them is minus 9 by 10 find the other

Answer 1

Answer:

-14/10 0r -7/5

Step-by-step explanation:

given that sum is equals to -1/2

and a number is given which is 9/10

to find the other rational no.  :

let he other rational number be x

9/10 + x = -1/2  

9+10x/10 = -1/2

9+10x = -1/2 × 10

9+ 10x = -5

10x = -5-9

10x = -14

x = -14/10 or -7/5                                                                        

Answer 2

Answer:

Step-by-step explanation:

Given :

The sum of two rational numbers is $-\frac{1}{2}$ ,.

One of them is $-\frac{9}{10}$,

To Find :

The other rational number,.

Solution :

Let the other number be x,

Then we get the equation as,

$x + (-\frac{9}{10}) = -\frac{1}{2}$

Then, by seperating the variables & constants,

We get,

$x = (-\frac{1}{2}) + (\frac{9}{10} )$

$x = -\frac{5}{10} + \frac{9}{10}$    ($\frac{1}{2}$ is equivalent to $\frac{5}{10}$ by multiplying both numerator & denominator by 5)

$x = \frac{-5+9}{10} =  \frac{4}{10} =  \frac{2}{5}$

∴ x = $\frac{2}{5}$

∴ The other number is $\frac{2}{5}$