A boy buys 3 apples and 1 orange juice for $1.35$.Agirlbuysanappleand2orangejuicefor$1.20$. how much does an apple cost?
Let $x be the cost of an apple, $y be the cost of orange juice.
{3x+y=1.35x+2y=1.2{6x+2y=2.7x+2y=1.25x=(6x+2y)−(x+2y)=2.7−1.2=1.5x=0.30.3+2y=1.2y=0.45
