Question 273799
a=how many 4 passanger carts there are
b=how many 6 passanger carts there are
{{{a+b=15}}}{{{a=15-b}}}
{{{4a+6b=72}}}uses substitution
{{{4(15-b)+6b=72}}}
{{{60-4b+6b=72}}}
{{{60+2b=72}}}
{{{2b=12}}}
{{{b=6}}}
{{{a=15-b}}}
{{{a=15-6}}}
{{{a=9}}}
theres {{{highlight(9)}}}4-passanger carts
theres {{{highlight(6)}}}6-passanger carts