Question 1196509
If choose r for daily rate and d for distance rate, then:

{{{system(3r+300d=111,5r+600d=207)}}}


You could try to find a strategy to solve the system.  Maybe first simplify the "Mateo" equation, dividing both sides by 3.


{{{system(r+100d=37,5r+600d=207)}}}


and then use five-times-Mateo's equation:

{{{system(5r+500d=185,5r+600d=207)}}}


and then follow with,....

{{{100d=22}}}

{{{highlight(d=0.22)}}}----------------   22 cents per mile.

-

{{{r+100d=37}}}

{{{r=37-100d}}}

{{{r=37-100*(0.22)}}}

{{{r=37-22}}}

{{{highlight(r=15)}}}--------------------  dollars per day, daily rate