SOLUTION: 2x+3y=-3 x+2y=2 This is the problem and my daughters teacher gave her this: -2R1+R2 Please explain how this is done

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Question 213891: 2x+3y=-3
x+2y=2
This is the problem and my daughters teacher gave her this: -2R1+R2
Please explain how this is done
Answer by drj(1380) About Me  (Show Source):
You can put this solution on YOUR website!
2x+3y=-3
x+2y=2

The following solves the system of linear equations by substitution.

Solved by pluggable solver: SOLVE linear system by SUBSTITUTION
Solve:
+system%28+%0D%0A++++2%5Cx+%2B+3%5Cy+=+-3%2C%0D%0A++++1%5Cx+%2B+2%5Cy+=+2+%29%0D%0A++We'll use substitution. After moving 3*y to the right, we get:
2%2Ax+=+-3+-+3%2Ay, or x+=+-3%2F2+-+3%2Ay%2F2. Substitute that
into another equation:
1%2A%28-3%2F2+-+3%2Ay%2F2%29+%2B+2%5Cy+=+2 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



I hope the above steps were helpful and I don't understand the statement: -2R1+R2

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And good luck in your studies!

Respectfully,
Dr J