S = t + 2; 2t + s = 17

There are two equations given in the question. Also there are two unknown variables in the form of "s" and "t". I hope you want to find the exact values of the two unknown variables in the question.

s = t + 2

And

2t + s = 17

Now let us put the value of s in terms of t from the first equation in the second equation.

Then

2t + s = 17

2t + t + 2 = 17

3t = 17 - 2

3t = 15

t = 15/3

= 5

Now let us put the value of t that we have already determined, in the first equation.

Then

s = t + 2

= 5 + 2

= 7

So the value of the unknown variable "t" is 5 and the value of the unknown variable "s" is 7.