Expert: Paul Klarreich - 6/28/2011

Question
solve for x and y in the equations..2x+y=3 (1st equation ) 3x-y=-3 (2nd equation) using substitution method..thanks

Answer
Questioner: rayxel
Country: Baguio, Philippines
Category: Advanced Math
Private: No
Subject: math
Question: solve for x and y in the equations..2x+y=3 (1st equation ) 3x-y=-3 (2nd equation) using substitution method..thanks
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Start with your first equation:

2x + y = 3

y = 3 - 2x    << rewrite it.

Now take your second:

3x - y = -3

3x - (3 - 2x)= -3  << substitute, and USE PARENTHESES.

Now simplify that and solve for x.  When you are done, take that value of x and substitute back into either equation.  

You can finish up.  (looks like  x = 0, y = 3, to me.)