Question

solve equation 2a-b =0 and a+b=-21​

Answer 1

Answer:

2a-b=0. -(1)

a+b=-21 -(2)

eq(2)*2,

2a+2b= -42

2a-b =0

- + +

0+3b=-42

b= -14

let b= -14 eq (1),

2a-(-14)=0

2a+14=0

2a= -14

a =-7

Answer 2

Answer:

yes obviously I will solve it.

Step-by-step explanation:

a+b= -21

or, a= -21-b

2a-b=0 ................ (i)

now putting the value of (a) In the equation (i), we get,.

2a-b=0

or, 2×(-21-b) -b =0

or, -42-3b=0

or, -3b=42

or, b= -(42/3) = -14

therefore the value of a = -21-b

= -21-(-14)

= -21+14

= -7.

and value of b= -14.