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

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Question 214870: solve by elimination method
9x-9y=9
7y-3x=-5

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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

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: Error: 'Can't call method "invoke_solver" on an undefined value at /home/ichudov/project_locations/algebra.com/templates/Algebra/Solver/PerlSolver.pm line 115. Can't call method "invoke_solver" on an undefined value at /home/ichudov/project_locations/algebra.com/templates/Algebra/Solver/PerlSolver.pm line 115. '. Can't call method "invoke_solver" on an undefined value at /home/ichudov/project_locations/algebra.com/templates/Algebra/Solver/PerlSolver.pm line 115. Can't call method "invoke_solver" on an undefined value at /home/ichudov/project_locations/algebra.com/templates/Algebra/Solver/PerlSolver.pm line 115.
error_location: 101

Same result as before...

I hope the above steps were helpful.