Answer:
<em><u>First box/top box is 2 because 8 - 6 = 2</u></em>
<em><u>Second box/bottom box is 1 because 8 - 7 = 1</u></em>
The formula for the nth term of an arithmetic sequence is:

where a is the first term and d is the common difference.
Plugging the given values into the formula, we get:

The answer is b. 98.
Well if you make them both equal to y I got...
Y=-3x+1
Y=5x-3
But I don't think you can find it without the y since they are different variables. Like I know -3x and 5x are the slopes and 1 and -3 are the y intercepts but I'm stuck after that. Sorry if that wasn't any help.
Hope I helped.