To solve: The given system of equations algebraically.
Answer to Problem 40E
Explanation of Solution
Given information: System of equations:
Calculation:
Start by combining equations 1 and 2 to get,
Next we want to combine equations 2 and 3 in way to get rid of the z term there also. But we must multiply each equation in such a way as to make that possible.
Combine these
Gives us:
Now we use this equation and the equation we got by combining (1) and (2) to solve for x and y ,
To get a common coefficient on the x term the top equation must be multiplied by 7 and the bottom equation by 5.
Now subtract the bottom row from the top,
Plugging back into any of the previous equations that only had x and y in it can get us x .
Now plug this x and y into one of the three original equations to solve for z , I will use equation (1).
Thus,
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