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# EASY MATHS (QUICK)

Solve these pairs of simultaneous euations.2z+3w=20-7i

iz-2w=-6+6iThe ans is:

z=4-2i

w=4-i show workings

### 1 Answer

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- 螞蟻雄兵Lv 710 years agoFavorite Answer
Solve these pairs of simultaneous euations.

2z+3w=20－7i

iz－2w=－6+6i

Sol

2(2z+3w)+3(iz－2w)=2(20－7i)+3(－6+6i)

(4+3i)z=22+4i

z=(22+4i)/(4+3i)

=(22+4i)(4－3i)/[(4+3i)(4－3i)]

=(88－66i+16i+12)/(16+9)

=(100－50i)/25

=4－2i

3w=20－7i－2(4－2i)

=20－7i－8+4i

=12－3i

w=4－i

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