tchou8306
27.02.2020 •
Mathematics
Please explain and walk through problem. Thanks
context: "Solve each system of linear equations by substitution."
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Ответ:
Solving a system by substitution means that you use one equation (in this case, the second) to express one variable in terms of the other (in this case, in the second equation, we express in terms of .
So, we can substitute this expression for in the first equation, we have
But since we know that
We have
We can now solve this equation as usual, since it involves alone:
And once we know that value for , we can compute :
Ответ: