Posted by Esther on Monday, October 26, 2009 at 7:42pm.
At a club play, 117 tickets were sold. Adults' tickets cost $1.25 and
children's tickets cost $0.75. In all, $129.75 was taken in. How many of
each kind of ticket were sold?
I don't know how to set up the equation.
Work Done
Is it:
1.25x + 0.75y=129.75
this is what I've done but it doesn't seem right!

Math  Reiny, Monday, October 26, 2009 at 8:07pm
but you also know that x+y = 117 from which
y = 117x
now plug that into your first equation and continue. 
Math  Esther, Monday, October 26, 2009 at 8:09pm
By process of elimination?

Math  jim, Monday, October 26, 2009 at 8:17pm
More like substitution.
You already worked out the hard bit:
1.25x + 0.75y = 129.75
and Reiny pointed out that
y = 117x
So you can replace (substitute) y in your equation:
1.25x + 0.75(117x) = 129.75
and I'm sure you can see your way home from there. 
Math  Esther, Monday, October 26, 2009 at 8:17pm
Ok...I got it now, Thanks