3*(-2)-b*3+4*b=-1 a*(-2)+2*3+a+b=19 _______________________ -6-3b+4b=-1 -2a+6+a+b=19 ______________________ b=-1+6 -a+b=19-6 ______________________ b=5 -a+5=15 -a=10 a=-10 _____________ a=-10, b=5