Question

What is the value of z2 if 3z1 = 6 + 18i and z1 + z2 = 5 + 9i?

Answer 1

z2=-3-3i

Explanation:

3z1+0z2=6+18i

z1+z2=5+9i (×3)

3z1+3z2=15+27i

3z1+0z2=6+18i (-) =

-3z2=9+9i

z2=-3÷(9+9i)

z2=-3-3i