Rule

Slope-Intercept Form

One way to express linear function rules is called slope-intercept form.

y=mx+by=mx+b

Sometimes, f(x)=mx+bf(x)=mx+b is used. In either case, mm and bb describe the general characteristics of the line. mm indicates the slope, and bb indicates the yy-intercept. The linear function graphed below can be expressed as f(x)=2x+1, f(x)=2x+1, because it has a slope of 22 and a yy-intercept at (0,1).(0,1).

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