I have to complete a summer packet of 90 Algebra 2 questions. I have completed 89 of them, the only one I could not get was this. I know the answer is $y = \frac {47}2$, $\frac 17$ according to WolframAlpha, but I have no idea how to reach that answer, my Algebra 2 Honors teacher couldn't figure it out.
Directions: Use substitution or linear combination to solve each system.
$\dfrac 3{(x-1)} + \dfrac 4{(y+2)} = 2$ $\dfrac 6{(x-1)} - \dfrac 7{(y+2)} = -3$