Give \(I_1 = 1A\),as follows
Ask for \(I_s\) = ?
Ask for \(I_s\) = ?
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The value for Is is a positive 1A. That means that the current is in the direction that was assumed by the arrow.\({Equation\, 1:}\, \, \, \,Vx\,=\, \Large \frac{\frac{-3}{R1}-I_S}{{\frac{\,1\,}{R1}}\,+\,{\frac{\,1\,}{R2}}} \,=\, \Large \frac{\frac{-3}{1}\, -\, I_S}{{\frac{\,1\,}{1}}\,+\,{\frac{\,1\,}{1}}} \,=\, \Large \frac{-3\, -\, I_S}{{1}\,+\,{1}} \,=\, \Large \frac{-(3\, +\, I_S)}{2}\)
\({Equation\, 2:}\, \, \, \,Vx\, =\, 1\, (R1)\, -\, 3\, =\, 1\, (1)\, -\, 3\, =\, -2 \)
Plug the value for Vx from Equation 2 into Equation 1, then solve for Is.
\(-2\, =\, \Large \frac{-(3\, +\, I_S)}{2}\)
\(-4\, =\, \Large {-(3\, +\, I_S)}\)
\(4\, =\, \Large {(3\, +\, I_S)}\)
\(I_S\, =\, \Large 1\)
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