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You can write this as two equations by saying the positive and negative of the inside of the absolute value is equal to 15.  This will give 2y - 2 = 15 and -(2y-2) = 15.  For the first equation we add two to both sides to get 2y - 2 +2 = 15 + 2.  This givese you 2y = 17...

First let's get the variable y all onto one side.  We do this by subtracting y from each side to get 3y - y = y - y + 10.  This gives us 2y = 10.  Then we divide each side by 2 and get 2y/2 = 10/2 and get  y = 5.  We then check our answer by substituting 5 into...

|x| = 0 means that x has to be equal to either the negative or positive value.  This is called the absolute value.  0 is not negative or positive and therefore the equation has one solution.  The solution is x = 0.

9)  Percent change is the amount of change with respect to the old price.  The equation is % change = 100*(new - old)/old = 100*(new/old - 1).  We then plug in 70 for old and 49 for new and get 100*(49/70-1) = -30.  The perecent change is -30%. 10.  We have the original...