Answer: d :)
Step-by-step explanation:
Don’t know if there’s much of an equation for it, but I guess the best way to write it out is 10 + x = -18. Then, you would subtract the 10 from both sides in order to isolate the x. So then you’re left with x = -28. So -28 is your answer.
the x s are the independent variable so any direct change to them is changing the independent. like the second one has -5 on the x
200+40=240
each train cost 10
take 240/10=24trains
