I'm not too sure where to start, but 6 is the magnitude and (2pi/4) is the angle? So if I were to plot this on a graph I could get the value of the point on the horizontal and vertical axis. I've tried to plot is using graphing software but it wasn't working so I'm not sure if i was doing it...
I think i did it!
-c=0
-2a-2c=-1 = -2a-2(0)=-1 = -2a=-1 = -a=-1/2 or -0.5
SO a=0.5
-a-3b+0=1 = -a-3b=1 = -0.5-3b=1 = -3b=1.5 = -b=1/2 or 0.5
SO b=-0.5
when i plug them back in i get the following:
a+b=0 -------->...
a+b=0
so..
a= -b
-2a-2c = -1 = -2(-b)-2c = -1 = 2b-2c=-1
-a-3b+c= 1 = -(-b)-3b+c= 1 = b-3b+c=1 = -2b+c=1
i think this is right but i don't know where to go from here