Question 406634
adult tickets:{{{x}}} 

student tickets: {{{y}}}

100 students:{{{100y}}}
 and 
200  adults : {{{200x}}} 


{{{200x + 100y = 850}}}


adult tickets cost $2 more than student tickets: {{{200(y+2)}}} 


{{{200(y+2)+ 100y=850}}} .....find {{{y}}}

{{{200y+400+ 100y=850}}}

{{{300y =850-400}}}

{{{300x=450}}}

{{{y=450/300}}}

{{{y=1.5}}}..........student tickets

{{{x=1.5+2=3.5}}}....adult tickets


check:

{{{200(3.5)+100(1.5)=850}}}
{{{700+150)=850}}}

{{{850)=850}}}