I think I'm doing the steps right but I'm not turning out with the right answer.. ): help? $\displaystyle 2a-7b=-12 and -a+4b=7$ Substituting method is the way im doing it.
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$\displaystyle 2a-7b=-12$ $\displaystyle -a+4b=7\Rightarrow a=4b-7$ $\displaystyle 2(4b-7)-7b=-12$ $\displaystyle 8b-14-7b=-12$ $\displaystyle b=2$
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