Posted by Team A on Tuesday, September 14, 2010 at 7:46pm.
It takes work to find the answers, but it is much easier to check a given answer, namely by back-substitution. This is especially important in exams where you can check and reassure yourself you have the right answer.
for
7x+6y=15...(1)
-7x+y=27...(2)
add (1) and (2) to get
7y=42
Solve for y and substitute y in (1) to get x=-3.
Related Questions
algebra 1 - I was just wondering if anybody could explain to me the steps in &#...
Algebra - I need help solving the trinomial (x squared minus four x plus ...
algebra - I'm working on solving linear systems by substitution, here are ...
math - from the looks of things I am in good company when it comes to having ...
World History - What are five influences from ancient Greece that can be found ...
Algebra - Solve: 3x-2y=10 2x+3y=-2 Graph: Substitution: Elimination: Show Your ...
algebra - 2 pairs of shoes, 5 pairs of pants, and 6 shirts on a trip. Assuming ...
algebra - Please please help, this is like the only thing i am having trouble ...
Math-Algebra - Solve: 3x-2y=10 2x+3y=-2 Graph: Substitution: Elimination: Show ...
Algebra - I am having trouble with this one… Can someone please show me the...
For Further Reading
