## Algebra 1

$3x+3y = 195$ $4x+7y = 390$ $x = 25$ minutes (small centerpiece) $y = 40$ minutes (large centerpiece)
$3x+3y = 195$ $4x+7y = 380$ x = small, y = large $3x+3y = 195$ $-4*(3x+3y = 195)$ $-12x-12y = -780$ $4x+7y = 380$ $3*(4x+7y = 380)$ $12x + 21y = 1140$ $-12x-12y +12x + 21y= 1140-780$ $9y = 360$ $9y/9 =360/9$ $y = 40$ $3x+3y = 195$ $3x+3*40 = 195$ $3x+120 = 195$ $3x+120-120 = 195-120$ $3x = 73$ $3x/3 = 75/3$ $x = 25$