Question

solve ax + by =a-b and bx -ay=a+b by cross multiplication method

Answer 1

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Answer 2

Answer:

ax+by=(a-b)__(1)

bx-ay=(a+b)__(2)

Let eqn(1)×a+eqn(2)×b

= (ax+by)a+(bx-ay)b=(a-b)a+(a+b)b

=a²x+aby+b²x-aby=a²-ab+ab+b²

=a²x+b²x=a²+b²

=x= 1

putting the value in eqn (1) we get

=a×1+by=a-b

= y=-1