PreAlgebra
posted by Ellen .
If negative 20 equals 168, negative 15 equals 153, negative 10 equals 138, negative 5 equals 123, 0 equals 108, 5 equals 93, 10 equals 78, 15 equals 63, 20 equals 48, then what is the rule???
Tables:
X: 20 15 10 5 0 5 10 15 20
Y: 168 153 138 123 108 93 78 63 48
How do I get from X to why, wat is the rule to get y using the number x?
Also, what is the pattern in the informatio above???

y= 3x + 108

Please help me with solving equations with rational numbers. i have struggled in math all my life. I desperately need help with my homework.
Thank you 
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oh wait nevermind

haha actually that's the correct answer
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