The pressure in a car tire is given by p(x) = 31 - X where p is pressure in psi and x is the number of months
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0.5s + 1 = 7 + 4.5s Subtract 4.5s from both sides
-4s + 1 = 7 Subtract 1 from both sides
-4s = 6 Divide both sides by -4
s = -
Simplify
s = -
-4s + 1 = 7 Subtract 1 from both sides
-4s = 6 Divide both sides by -4
s = -
s = -