Answer:
1) rise=4
run=6
slope=4/6 simplifies to ⅔ and make sure you put a negative sign because the gradient is decreasing so -⅔
2) rise=0
run=6
slope=0/6 or no slope because there's no increase or decrease.
3) rise=7
run=0
slope is 7/0 or undefined.
4) rise=4
run=8
slope is 4/8 which simplifies to ½ and negative sign because gradient is decreasing so -½
5) rise=6
run=3
slope is 6/3 or 2, stays positive because its increasing in the gradient.
6) slope is 1
7) slope is 2.5
8) slope is -⅓