SOLUTION: use either substitution or the addition-subtraction method to solve.
2x-y=5
2x+3y=13
here's what i came up with:
2x-y+2x+3y=5+13
2y=18-4x
y=9-2x
2x-9+2x=5
4x=14
x=7/2
Algebra ->
Expressions-with-variables
-> SOLUTION: use either substitution or the addition-subtraction method to solve.
2x-y=5
2x+3y=13
here's what i came up with:
2x-y+2x+3y=5+13
2y=18-4x
y=9-2x
2x-9+2x=5
4x=14
x=7/2
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Question 878852: use either substitution or the addition-subtraction method to solve.
2x-y=5
2x+3y=13
here's what i came up with:
2x-y+2x+3y=5+13
2y=18-4x
y=9-2x
2x-9+2x=5
4x=14
x=7/2
y=9-2(7/2)
y=9-7
y=2
can you show me if i am wrong and how to check my answer?
You can put this solution on YOUR website! Your first step makes no sense. Why? It is a substitution but gives you no useful information. Try subtracting the two equations instead! This will be the beginning for the Elimination Method, since subtracting one equation from the other will eliminate the 2x from this result.
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