in a book store, pencils and pens cost different amounts. two pencils and 3 pens cost Php 50. the total cost of 3 pencils and 2 pens is Php 45. what is the cost of 1 pencil?
Php 7 let x=cost of 1 pencil let y=cost of 1 pen 2x+3y=50 3x+2y=45 Subtracting the two equations we get y-x=5 y=x+5 substituting y into one of the two equations 2x+3(x+5)=50 2x+3x+15=50 5x+15=50 5x=50-15 5x=35 --- --- 5 5 x=7