Question

9. Verify a + b = b + a for

a = 5/7. and b= -9/4​

Answer 1

Answer:

Step-by-step explanation:

(i) a=21,b=18

So, a−(−b)=21−(−18)=21+18=39

a+b=21+18=39

∴a−(−b)=(a+b)

(ii)a=118,b=125

So, a−(−b)=118−(−125)=118+125=243

a+b=118+125=243

∴a−(−b)=(a+b)

(iii)a=75,b=84

So, a−(−b)=75−(−84)=75+84=159

a+b=75+84=159

∴a−(−b)=(a+b)

(iv)a=75,b=11

So, a−(−b)=75−(−11)=75+11=86

a+b=75+11=86

∴a−(−b)=(a+b)

I HOPE IT HELPS you

Answer 2

Answer:

Given:a=-9/5,

b=5/7

{-(-9/5)} +{-(5/7)} =-(-9/5+5/7)

(9/5)+(-5/7)=9/5-5/7

9/5-5/7=9/5-5/7

LHS=RHS

hence,proved

Step-by-step explanation: