SOLUTION: solve by elimination method 9x-9y=9 7y-3x=-5

Question 214870: solve by elimination method
9x-9y=9
7y-3x=-5
Answer by drj(1380) (Show Source): You can put this solution on YOUR website!
Solve by elimination method
Equation A
Equation B

Step 1. Multiply Equation by 3 and add to equation A

Equation A
Equation B-1 after multiplying by 3
Adding above equations yield,

Step 2. Substitute y=-1/2 into one of the equations say Equation A

Equation A

Step 3. Solution is (1/2,-1/2) or and

As a check, let's solve by elimination

Solved by pluggable solver: SOLVE linear system by SUBSTITUTION

Solve:
We'll use substitution. After moving -9*y to the right, we get:
, or . Substitute that
into another equation:
and simplify: So, we know that y=-0.5. Since , x=0.5.

Answer: .

Same result as before...

I hope the above steps were helpful.

For FREE Step-By-Step videos in Introduction to Algebra, please visit http://www.FreedomUniversity.TV/courses/IntroAlgebra and for Trigonometry visit http://www.FreedomUniversity.TV/courses/Trigonometry.

Good luck in your studies!

Respectfully,
Dr J

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