Answer: 
Step-by-step explanation:
You want to isolate s which means get it by itself. So all you gotta do is divide both sides by t
-21/5
Multiply 4 and 5, add 1
X=-5 and y=1
you would replace the letter x or y with zero to find the intercept.
First you would do -30x5 which equals -150 then 2-150 equals -148

I simply divided by 100 and moved the decimal two places to the left.