<PRE><B>Question 949090</B>
x, adult price
c, child price
-
x=2c+1
-
45 adult tickets, and 70 children tickets, revenue $525:
{{{45x+70c=525}}}
substitute for x.
{{{45(2c+1)+70c=525}}}
Continue from that.


The TWO EQUATIONS you would start with is this system:
{{{system(x=2c+1,45x+70c=525)}}}


You could use y instead of c if you want.  Just be clear about saying what each variable means.</PRE>