Answer:
y = -6x + 360
let's use some of the coordinates to check:
y = -6(10) + 360
y = -60 + 360
y = 300
y = -6(20) + 360
y = -120 + 360
y = 240
y = -6(30) + 360
y = -180 + 360
y = 180
checks out :)
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