Question 1067484
d dimes
q quarters


Coins description, and money in cents:
{{{system(d-q=26,10d+25q=645)}}}


{{{system(2d+5q=129,d-q=26)}}}



ELIMINATION METHOD-FINDING q

{{{2d+5q-(2d-2q)=129-52}}}
{{{7q=77}}}
{{{q=77/7}}}
{{{highlight(q=11)}}}, quarters


SUBSTITUTION - FINDING d
{{{d=26+q}}}
{{{d=26+11}}}
{{{highlight(d=37)}}}, dimes