Thread: hi just need a quick hand not the answer please

the question is
z = (2-i)
w=(5+3i)
so work out
a)zw
b)z/w
both of which i can do with no problem but the last bit is
c) |w|
can some one please tell me what the 2 straight lines mean on each side of the w thank you 4 ur time and any help

also im a bit stuck with this simultaneous equation i have never done them with fractions in i think it is easy but i might just be looking at it in the wrong way
4/x+1/y=5/3
1/x-3/y=3/2
should i be trying to get it on 1 line so times it by xy any help would be very greatfull thank you

Originally Posted by alpharebel10

the question is
z = (2-i)
w=(5+3i)
so work out
a)zw
b)z/w
both of which i can do with no problem but the last bit is
c) |w|
can some one please tell me what the 2 straight lines mean on each side of the w thank you 4 ur time and any help

|w| is the absolute value of w

also im a bit stuck with this simultaneous equation i have never done them with fractions in i think it is easy but i might just be looking at it in the wrong way
4/x+1/y=5/3
1/x-3/y=3/2
...

Set and then your system of equations becomes:



Solve for r and s and re-substitute to calculate x and y.

Originally Posted by alpharebel10

c) |w|
can some one please tell me what the 2 straight lines mean on each side of the w thank you 4 ur time and any help

See here.