Plz help need soon question is in description

Question

There is a two-digit number whose units digit is six less than the tens digit. Four times the tens digit plus five times the units digit equal 51. Find the digits.

Answer 1

A two- digit number: xy

x=y+6

4x+5y=51

 

5x -5y=30

4x+5y=51

9x=81

 

x=9

y=3

The number is 93