# Math Help - Systems of equations

1. ## Systems of equations

I think I'm doing the steps right but I'm not turning out with the right answer.. ): help?

$2a-7b=-12 and -a+4b=7$

Substituting method is the way im doing it.

2. $2a-7b=-12$

$-a+4b=7\Rightarrow a=4b-7$

$2(4b-7)-7b=-12$

$8b-14-7b=-12$

$b=2$