Chapter 6 - Systems of Equations and Inequalities - Chapter Test - Page 407: 15

$.3x+.5y=.42$ $x+y=200$ 80 liters of 30% and 120 liters of 50%

$x$ for 30% insecticide, $y$ for 50% insecticide $.3x+.5y=.42*200$ $x+y=200$ $x+y=200$ $x=200-y$ $.3(200-y)+.5y=.42*200$ $60 -.3y+.5y = 84$ $60+.2y=84$ $.2y=24$ $y=120$ $x+y=200$ $x+120=200$ $x = 80$