Line slope — formula?
(y₂ - y₁)/(x₂ - x₁)
Vertical line — slope?
Undefined slope, x = constant
Positive slope — direction?
Line rises from left to right
Perpendicular slopes — relation?
Negative reciprocal, m₁ × m₂ = -1
Line intercepts — definition?
Points where line crosses axes
X-intercept — find?
Set y=0, solve for x
Y-intercept — find?
Set x=0, solve for y
Parallel lines — slope?
Same slope, different intercepts
Line equation from two points — step?
Calculate slope, then use point-slope form
Line in slope-intercept form?
y = mx + b, where b is y-intercept
Standard form to slope?
Solve for y to find slope from Ax + By = C
Horizontal line — slope?
Zero slope, y = constant
Answer 6 questions on Mastering Line Equations and Properties.
1. What is the slope calculation of a line between two points?
2. What is the name of the form of a line equation that is written using a point and the slope?
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