S+2t=6. 3s-2t=2

Using elimination

For the first one, I will solve for t.

s + 2t = 6, first we isolate the t variable,

2t = - s + 6, divide both sides by 2,

t = - s/2 + 3, < There's your answer for 1!

Here's the second one,

3s - 2t = 2, subtract 3s from both sides,

-2t = 2 - 3s, divide both sides by - 2,

t = - 1 + 3s/2 < There's your second answer!