Question

Stiind Ca 7 stilouri si 6 pixuri costa 235 de lei,iar doua stilouri si 3 pixuri costa 80 de lei,determinati ptretul unui pix si pretul unui stilou.

Answer 1

7s +6p=235. /2s+3p=80. / 3p=80-2S. / 7s+2(80-2s)=235. / 7s+160-4s=235. /3s=75. / s=25. /50 +3p=80. /3p=30 / p=10