A 2-digit number is twice the difference of its digits. What is the number?
let the unit digit be x
let the tens digit be y
the number is 10y + x
10y + x = 2(y-x)
10y + x = 2y - 2x
8y = -3x
mmmmhhhh?
do you have a typo?
let the tens digit be y
the number is 10y + x
10y + x = 2(y-x)
10y + x = 2y - 2x
8y = -3x
mmmmhhhh?
do you have a typo?