Answer:
a
Step-by-step explanation:
18x+3xy+5y-12xy+4y-8=18x-9xy+y-8
1. nth term=3n-1
20th term=3(20)-1=60-1=59
2. nth term=-2n-4
20th term=-2(20)-4=-40-4=-44
3. nth term=n-
20th term=(20)-=-=
4. nth term=-n+
20th term=-(20)+=-+=-
-2
slope formula is (y2-y1)/(x2-x1)
1 - -7 / -1 - 3
8 / -4