Question

i will mark the answer as brainliest ​

Answer 1

Solution :

We have,

$\tt\dagger \: \underline{ - (x + y) = ( - x) + ( - y)}$

$\tt\longmapsto - (x + y) =( - x ) + (- y).$

$\tt\longmapsto - (x + y) = - x - y.$

$\tt\longmapsto -( x + y) = - (x + y)$

Remove negative sign both sides,

$\tt\longmapsto x + y = x + y.$

LHS = RHS

$\rule{90}1$

Now,

• X = 2/3.
• Y = 5/7.

Putting given value.

$\tt\longmapsto ( \frac{2}{3} + \frac{5}{7} ) = ( \frac{2}{3} + \frac{5}{7} )$

$\tt\longmapsto \frac{14 + 15}{21} = \frac{14 + 15}{21}$

$\tt\longmapsto \frac{29}{21} = \frac{29}{21}$

Therefore, LHS = RHS.

Answer 2

†

−(x+y)=(−x)+(−y)

\tt\longmapsto - (x + y) =( - x ) + (- y).⟼−(x+y)=(−x)+(−y).

\tt\longmapsto - (x + y) = - x - y.⟼−(x+y)=−x−y.

\tt\longmapsto -( x + y) = - (x + y)⟼−(x+y)=−(x+y)

Remove negative sign both sides,

\tt\longmapsto x + y = x + y.⟼x+y=x+y.

LHS = RHS

Now,

X = 2/3.

Y = 5/7.

Putting given value.

\tt\longmapsto ( \frac{2}{3} + \frac{5}{7} ) = ( \frac{2}{3} + \frac{5}{7} )⟼(

3

2

+

7

5

)=(

3

2

+

7

5

)

\tt\longmapsto \frac{14 + 15}{21} = \frac{14 + 15}{21}⟼

21

14+15

=

21

14+15

\tt\longmapsto \frac{29}{21} = \frac{29}{21}⟼

21

29

=

21

29

Therefore, LHS = RHS.