Posted by **Team A** on Tuesday, September 14, 2010 at 7:46pm.

need help in solving by substitution. We all have different steps and all arrive at 3 different ordered pairs. please help and show the steps for

7x+6y=15 and -7x+y=27. Thanks

- Algebra -
**MathMate**, Tuesday, September 14, 2010 at 8:48pm
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.

## Answer this Question

## Related Questions

- algebra 1 - I was just wondering if anybody could explain to me the steps in '...
- math ergent please please... - 10.a)Solve the inequality x^3-5x^2+2x+8<0 by i...
- Algebra 1 - As a team we are having trouble coming up with the same ordered ...
- algebra - I'm working on solving linear systems by substitution, here are the ...
- Math - Can somebody please explain to me how to factor trinomials that contain ...
- algebra - please help! can someone show me the steps in solving this? find all ...
- Calculus Help Please!!! - show all of the algebraic steps in finding lim x->0...
- Calculus - How do I solve for lim h->0 (((a+h)^2 + 1)/(3(a+h)+7) - ((a^2 + 1...
- Algebra - we need help and the steps to solve 5x-y=18 and 5x+6y=-38. we need the...
- Algebra - Need help,i need to find the ordered pair. 3x+2y=40 and 2x + 3y =230/...

More Related Questions