Use functions to model relationships between quantities
Interpret the equation y = mx + b as defining a linear function, whose graph is a straight line; give examples of functions that are not
linear. For example, the function A = s2 giving the area of a square as a function of its side length is not linear because its graph contains
the points (1,1), (2,4) and (3,9), which are not on a straight line.
Construct a function to model a linear relationship between two quantities. Determine the rate of change and initial value of the
function from a description of a relationship or from two (x, y) values, including reading these from a table or from a graph. Interpret the
rate of change and initial value of a linear function in terms of the situation it models, and in terms of its graph or a table of values.
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