Coordinate Geometry (8) Flashcards
Midpoint…
Halfway between the x values and halfway between the y values, average them out
y = mx + b…when in this form…
y always equals B
Slope is positive when…
up and to right
Slope is negative when…
Down and to right
Y intercept…
Where x = 0
X intercept…
Where y = 0 and also where -b/m
Parallel lines have…
The same slope
Perpendicular lines have
Negative reciprocal slope
Slope =
Rise / run … change in Y / change in X (not vice versa!)
y = 0
horizontal line running through the origin
To find b…
Plug in known x,y coordinates
To find points of intersection for any two lines..
set y = mx + b equal to eachother; mx + b = mx + b
b = …
the y intercept (where slope crosses Y axis
When in doubt
DRAW AND MAP OUT
Remember what as a solving option?
Substituting as a systems of equations option
