P 4.2-7 The node voltages in the circuit shown in Figure P 4.2-7 are v_a = 7 V and v_b = 10 V. Determine values of the current source current, i_s, and the resistance, R.

Figure P 4.2-7

Writing out node equations

Node a:

Node b:

We know v_a and v_b, so plug in and solve for i_s and R

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