How would I use the addition-subtraction method for this

[From: ] [author: ] [Date: 11-10-23] [Hit: ]

-12x + 15y = -43
9x - 12y = 34

there is two variables here so that probably is a simultaneous equation.

keywords: use,this,for,How,method,would,addition,subtraction,the,How would I use the addition-subtraction method for this