Solving for I1 from Equations 1-3 with I2=0

[nhrock3]

after we put I2=0 in equations 1 to 3
we have expressions of I1
how did they get I1
because they presented numbers

 

[The Electrician]

If you let I2 be zero, then equation 1 becomes:

V1 = j5*I1

Substitute this into equation 3 and you have:

425<0 - 5*I1 - j5*I1 = 0

or

425<0 - (5 + j5)*I1 = 0

so that I1 = 425/(5 + j5)

Substitute this back into equation 2 (with I2 = 0), and you get V2.