
To calculate:
If we apply Kirchhoff’s law to the electrical network in the figure, the currents

Answer to Problem 67E
The values of the currents are
Explanation of Solution
Given information:
The given equations are
Calculation:
We can solve these equations by elimination method.
First, let us add equation 2 and 3 and then we get a equation with all three variables. Then we can eliminate any one of the variable.
Now we can solve equation 1 and the above formed equation to eliminate the variables.
Let us multiply equation 1 by 4 so that we can eliminate.
Let us add these both equations now,
Now we have a equation in two variable we can make into a equation which can be substituted into other.
Now we can substitute this in equation 2.
Now solving the above equation and equation 3 we get,
Multiply equation 3 by 7 and the above equation by 2 then we subtract them we get
By subtracting them we get,
Substitute this value in equation 3 we get
Substitute this in equation 2 we get the other variable.
Conclusion:
The values of the currents are
Chapter 7 Solutions
Precalculus with Limits
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