Question

4. the cost of 11 pencils and 3 erasers is 50 and the cost of 8 pencils and 3 erasers is 38. find the cost of each pencil and each eraser

Answer 1

let cp of pencil be x
let cp of erasers be y

so 11x+3y=50
and 8x+3y=38

so subtract both eq we get

3x=12 so x=3

substitute in eq 1

44+3y=50
3y=6
y=2