I've been trying to solve a book problem from Hayt, et al. Engineering Circuit Analysis (8th Ed.) —Practice Problem 11.9.
And here's my latest attempt, I just can't see what I'm doing wrong, why I don't get the answers from the book. Probably it's just some blunder I don't realize I'm making like a sign or a rule poorly applied. Please help me understand what I'm doing wrong.
\$V_1\$ is the voltage of the 1 \$\Omega\$ resistor.