Question 1160615
M movie price
V  video price


{{{system(9M+7V=56,3M+5V=34)}}}

-

{{{(9M+7V)+(3M+5V)=56+34}}}
.
.
{{{12M+12V=90}}}
.
.



Best way might be, multiply the "34" equation by 3:
{{{system(9M+7V=56,9M+15V=102)}}}


{{{E2-E1}}}:


{{{8V=46}}}

{{{highlight(V=5.75)}}}


To find M,
{{{M=(56-(7)(5.75))/9}}}