Question

substitution method; x +y=5
x-2y=2

Answer 1

Welcome to openstudy math.

Do you know what substitute means?

Answer 2

yes

Answer 3

Prove it.

Answer 4

omg. replacing something

Answer 5

That's exactly what you're doing here.
You're "combining" the two equations into one.

Answer 6

yes but i dont understand how

Answer 7

http://www.mathwarehouse.com/algebra/linear_equation/systems-of-equation/images/solutions-systems-linear-equations/solution-answer6.png

Answer 8

http://www.algebra-class.com/image-files/substitution1.gif

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