Ok, I hope I do this right...

The problem says

Set up a system of lineral equations and solve for the indicated quantinties.

Two positive numbers have a difference of 8. The larger number is 2 less than 3 times the smaller number. Find the numbers.

I have tried to say... a+b=-8 and 3b-2a=8 and then solve for b so I can substitute it in the 2nd equation...

b= -a-8

2nd equation would then be

3(-a-8) - 2a = 8

Then I solve for a. But I am doing something wrong because I get a= -6.4

The numbers are 13 and 5 but I can't come up with the right equations