Question 322509
First set up your variables.

$2 Tix = x
$3 Tix = (750-3x) <--- Total tickets minus the sum of $2 & $5 tickets
$5 Tix = 2x

Now multiply the variables by their value and add together to = the total value of the tickets (2625).

$2 Tix = 2(x)
$3 Tix = 3(750-3x)
$5 Tix = 5(2x)

{{{2x+2250-9x+10x=2625}}}
{{{3x+2250=2625}}}
{{{3x=375}}}

{{{x=125}}}  ($2)
{{{2x=250}}} ($5)
{{{750-3x=375}}} ($3)

*check*

number of tix... 
{{{125+250+375=750}}}
{{{750=750}}}

cost of tix...
{{{(2*125)+(5*250)+(3*375)=2625
{{{250+1250+1125+2625}}}
{{{2625=2625}}}