![]() All functions that can be written on the form f(x) = mx + b belong to the family of linear functions. You can use other letters than f to name functions.Ī group of functions that have similar characteristics are called a family of functions. You can name a function, f by using the function notionį(x) is another name for y and is read as "the value of f at x" or "f of x". In a direct variation the nonzero number m is called the constant of variation. the line we drew is correct.Ī line that passes through the origin has a y-intersect of zero, b = 0, and represents a direct variation. Our second point is a solution to the equation i.e. If the equation holds true than the second point is correct. You can check to see that the line you've drawn is the correct one by substituting the coordinates of the second point into the original equation. The m-value, the slope, tells us that for each step to the right on the x-axis we move 2 steps upwards on the y-axis (since m = 2)Īnd once you have your second point you can just draw a line through the two points and extend it in both directions. Plot the point corresponding to the y-intercept, (0,1) Where m is the slope and b is the y-intercept. In the slope-intercept form you use the slope of the line and the y-intercept to express the linear function. Now we're going to focus on the slope-intercept form y = mx + b. Earlier in this chapter we have expressed linear equations using the standard form Ax + By = C and also y= mx +b.
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