a+bi=0 only when a=0 and b=0 right? I was doing an SAT math level 1 problem that started with: y=7-x+(x+2)i so I changed it to: 0 = 7-x-y + (x+2)i So b=0 --> x=-2 --> y=9 , right?

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Originally Posted by lamp23 a+bi=0 only when a=0 and b=0 right? Yes. Originally Posted by lamp23 I was doing an SAT math level 1 problem that started with: y=7-x+(x+2)i so I changed it to: 0 = 7-x-y + (x+2)i So b=0 --> x=-2 --> y=9 , right? Yes. The real and imaginary parts must be equal so you solve the equations which is what you did in your head

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