SOLUTION: Elimination Method OR Substitution OR Substitution-Equal Values Method 1.y=3x-2 y=x+4 2.5x-4y=27 3x+4y=29 3.2x+5y=25 y=x+4

Algebra ->  Average -> SOLUTION: Elimination Method OR Substitution OR Substitution-Equal Values Method 1.y=3x-2 y=x+4 2.5x-4y=27 3x+4y=29 3.2x+5y=25 y=x+4      Log On


   

Question 1181622: Elimination Method OR Substitution OR Substitution-Equal Values Method
1.y=3x-2
y=x+4
2.5x-4y=27
3x+4y=29
3.2x+5y=25
y=x+4
Answer by greenestamps(13200) About Me  (Show Source):
You can put this solution on YOUR website!


1. y=3x-2
y=x+4

The given is two different expressions both equal to y.
Use what you are apparently calling Substitution-Equal Values Method:

3x-2 = x+4
...

2. 5x-4y=27
3x+4y=29

The given has one equation with "-4y" and the other with "+4y".
Clearly, use Elimination Method:

8x = 56
...

3. 2x+5y=25
y=x+4

The given has one in standard form Ax+By=C; the other is in "y=" form.
Clearly, use Substitution Method

2x+5(x+4)=25
...