SOLUTION: I sent in one for elimination now I have one more for substitution Please solve the equation using substitution x + y = 0 3x + y = -4 Thank you

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Question 1154361: I sent in one for elimination now I have one more for substitution
Please solve the equation using substitution
x + y = 0
3x + y = -4
Thank you
Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39618)   (Show Source):
You can put this solution on YOUR website!

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Answer by ikleyn(52788)   (Show Source):
You can put this solution on YOUR website!
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About solving systems of linear equations with 2 unknowns by the Elimination or/and Substitution methods, see the lessons
    - Solution of the linear system of two equations in two unknowns by the Substitution method
    - Solution of the linear system of two equations in two unknowns by the Elimination method
in this site.

Also, you have this free of charge online textbook in ALGEBRA-I in this site
    - ALGEBRA-I - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this online textbook under the topic "Systems of two linear equations in two unknowns".

Save the link to this online textbook together with its description

Free of charge online textbook in ALGEBRA-I
https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson

to your archive and use it when it is needed (i.e. ALWAYS).