Hi! May you please explain number 8 from the practice questions in the “lines” chapter? I understand that A is the correct answer after looking at the table values, but I don’t understand it from the equation itself. Thanks!

Sure. You’re given the equation p=100-7\left(\dfrac{d}{2}\right), but because this is the lines chapter, let’s put it in slope-intercept form.


We’ve got a slope of -\dfrac{7}{2} there, which means the dependent variable (p, in this case) decreases by 7 every time the independent variable (d) increases by 2.

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