Question 1179776
n nylon price
w wool price

{{{system(15n+26w=1345,10n+20w=990)}}}
Do what you know or need.


Try simplify first.
{{{(1/10)*E2}}}


{{{system(15n+26w=1345,n+2w=99)}}}
next might try sub for n.


{{{15(99-2w)+26w=1345}}}

{{{15*99-30w+26w=1345}}}

{{{-4w=1345-15*99}}}

{{{w=(15*99-1345)/4}}}
keep going,...