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.
