Answer :
x - price for roll of collor film
[tex]x +1.50 [/tex]- price for black and white roll of film
[tex]5x+4(x+1.50)=24[/tex]
[tex]5x+4x+6=24[/tex]
[tex]9x=18[/tex]
[tex]x=2[/tex]$
[tex]2+1.50=3.50[/tex]$
One roll of the black and white film costs 3.50$
[tex]x +1.50 [/tex]- price for black and white roll of film
[tex]5x+4(x+1.50)=24[/tex]
[tex]5x+4x+6=24[/tex]
[tex]9x=18[/tex]
[tex]x=2[/tex]$
[tex]2+1.50=3.50[/tex]$
One roll of the black and white film costs 3.50$