Question

Two numbers have a sum of 18. If the small number doubled, and then subtracted from the larger number, the difference is 9. X represents the smaller number, Y represents the biggest number. Write an equation to model the sum of numbers.

Answer 1

Two numbers have a sum of 18.

Let these two number be x,y
x+y=18

If the small number doubled, and then subtracted from the larger number, the difference is 9

let x be smaller number

y-2x=9