A used CD is a dollar more than one third the price of a new CD. If a new CD costs $18, how much is a used CD
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The answer to the question.
The equation for working out the slope of a linear line is: , where x and y are the coordinate pairs.
So just pick two of the purple dots on the graph and fill in the equation.
I'll pick the dot that's (-4, 1) and (4, -7).
Now I just do , which is just
when simplified.