Question 1026213
Change the question to, "How many hours did he work at EACH job?"


A, the hours at job A
B, the hours at job B


Account for the earnings:  {{{6A+9B=189}}}


Account for the total hours:   {{{A+B=24}}}



What to do now:
Simplify the earnings equation, and solve the simultaneous equations for A and B.  Use the Elimination Method, IF you know it; otherwise just use substitution method.




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{{{system(2A+3B=63,A+B=24)}}}


{{{system(2A+3B=63,2A+2B=48)}}}


{{{(2A+3B)-(2A+2B)=63-48}}}
{{{B=63-48}}}
{{{B=15}}}-------hours at job B
-
{{{A=9}}}-------hours at job A