Modeling

How to write an equation based on the table of values.

y-intercept: starting value (when x=0) slope (m) = change in graph when x value changes by one first differences

y = mx + b

What happens when y-intercept (b) is zero? direct variation What happens when y-intercept (b) is not zero? partial variation

What happens when slope is positive? negative? zero?

Equations of vertical and horizontal lines.

horizontal lines: y = value

vertical lines: x = value


 * Solving Problems:**

__Direct variation__ prices currency exchange unit conversions distance density current, resistance, voltage Hooke's Law

__Partial Variation__ Prices - pizza, taxi, phone Temperature (conversions) Distance (with headstart)