Question

the cost of notebook is twice the cost of a pen write a linear equation in two variables to represent this statement​

Answer 1

let the cost of pen be x then the cost of notebook is 2x

therefore 2x-x=0

Answer 2

let the cost of the notebook be x

" " pen. be y

so,

x=2y

therefore the linear equations in two variables is x-2y+0=0