part 1 : Marissa is walking at a fixed rate.
part 2 :
she is 10 blocks away...she looks at her watch.....she is 8 blocks away...6 minutes have passed.....that means in 2 blocks, it took 6 minutes.....that means to walk 1 block, it takes 3 minutes. So the slope is -3. The point (0,10) is when she first looked at her watch, she was 10 blocks from Sanjays house. The point (6,8)...means that 6 minutes after she looked at her watch, she was 8 blocks away