Question

if x=a , y=b is the solution of the pair of equations x-y=2 and x+y=4 , find the value of a and b

Answer 1

a=3

b=1

as a-b=3-1=2

a+b=3+1=4

Answer 2

X-Y=2. equ.1

X=Y+2. equ.2

X+Y=4. (GIVEN)

Y+2+Y=4

2Y+2=4

2Y=4-2

2Y=2

Y=1

°.°X=a

Y=b

.°.b=1 and a=3