Question 1073378
If you are trying to use Elimination Method, factor of 2 seems not to be a useful choice.


{{{system(9a+8b=770,5a+6b=490)}}}


Maybe try to eliminate terms of b.
8*3=24,and,6*4=24.



{{{system(3(9a+8b)=3*770,4(5a+6b)=4*490)}}}


{{{system(27a+24b=2310,20a+24b=1960)}}}
Here, subtract equation #2 from #1.


{{{7a=2310-1960}}}

{{{7a=350}}}

{{{highlight(a=50)}}}


Now maybe you can find how to solve for b on your own.  If you do this through Elimination, go back to the original system of equations and work from there.