Question

(iv) ax + by + a = 0, bx + ay + b = 0​

Answer 1

Answer:

ax + by + a = 0 (multiply with b)

abx + b^2 y + ab = 0

bx + ay + b = 0 (multiply with a)

abx + a^2 y + ab

subtract both

y (a^2 - b^2) = 0

so a = b