Question 1181622
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1.  y=3x-2
y=x+4<br>
The given is two different expressions both equal to y.
Use what you are apparently calling Substitution-Equal Values Method:<br>
3x-2 = x+4
...<br>
2.  5x-4y=27
3x+4y=29<br>
The given has one equation with "-4y" and the other with "+4y".
Clearly, use Elimination Method:<br>
8x = 56
...<br>
3.  2x+5y=25
y=x+4<br>
The given has one in standard form Ax+By=C; the other is in "y=" form.
Clearly, use Substitution Method<br>
2x+5(x+4)=25
...<br>