You are selling tickets for a high school play student tickets cost $4 and adult tickets cost $6, you sell 450 tickets and collect 2340, how many of each type of ticket did you sell

S + A = 450

$4S + $6A = $2340

S + A = 450

-6 (S + A = 450)

-6S + - 6A = - 2700

4S + 6A = 2340

-2S = - 360

-2S/-2 = - 360/-2

S = 180

S + A = 450

180 + A = 450

180-180 + A = 450-180

A = 270

Check

$4S + $6A = $2340

$4 (180) + $6 (270) = $2340

$720 + $1620 = $2340

$2340 = $2340