00:02
Okay, let's let our two digit number be represented by a, b.
00:06
So a is the tens digit, and b is the one's digit.
00:14
And we're told in the problem that when you add the digits, you get 14.
00:18
So a plus b is 14.
00:20
There's one equation.
00:22
And then we're also told that twice the tens digit, so that would be 2a, twice the 10s digit exceeds the units digit by 1.
00:32
So is equal to the unit's digit b plus 1.
00:37
Okay, so let's go ahead and solve this system for a and for b and then we'll know our two digit number.
00:45
So i'm going to go ahead and use the substitution method.
00:50
I'm going to take my second equation and isolate b...