Answer:
a=28; b=20.
Step-by-step explanation:
1) 2*(-4)=(a+b)+(-2a) and .
2) using the two equations it is possible to make up (then solve) the next system:
[tex]\left \{ {{2*(-4)=(a+b)+(-2a)} \atop {2*8=3b+(2b-3a)}} \right. \ => \ \left \{ {{-a+b=-8} \atop {-3a+5b=16}} \right. \ => \ \left \{ {{a=28} \atop {b=20}} \right.[/tex]
