Question

X+y =a-b,ax-by=a2+b2substitution method

Answer 1

Answer

x + y = a - b

x = a - b - y ...(i)

ax - by = a^2 + b^2

Put (i):

a^2 - ab - ay = a^2 + b^2

=> -y ( a + b ) = b ( a + b )

=> y = -b

x = a - b + b

=> x = a