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4 terms

chapter 3 formulas

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General standard Form
ax+by=c

~ Good for telling if an equation is linear and graphing by the cover-up method
Slope-intercept Form
y=mx+b

~ Good for graphing, finding the slope, finding the y-intercept and answering the question.
Point-slop Form
y-y1=m(x-x1)

~ Good for answering word problems. ( m = the slope of the line.... (x1,y1) = a point on the line)
Slope Formula
m = (y2 - y1) / (x2 - x1) ; known as rise/run

~ Gives the slope of a line through (x1,y1) and (x2,y2)