Answer:
0
Step-by-step explanation:
gradient is change in y coodinates devided by change in x coordinates which is (-2-8)÷(7-7) being that 7-7 is zero the whole value will be 0 to mean the slope is 0
1
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(10,5), (-12,-6), (-18, -9), (-8, -4), (20,10)
(-15, 5), (-18, 6), (-21,7), (33, -11), (24, -8)
10/5=2, -12/-6=2, -18/-9=2, -8/-4=2, 20/10=2
-15/5= -3, -18/6= -3, -21/7= -3, 33/-11= -3, 24/-8= -3