Answer:
I put the points below, i hope you know how to graph them but if you dont let me know.
Explanation:
x, y
-15, 6
-12, 5
-9, 4
-6, 3
-3, 2
0, 1
6, -1
9, -2
12, -3
15, -4
if you want more points let me know, also the numbers in between were decimals so that's why I didn't include them.